{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-0300", "assignerOrgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0", "state": "PUBLISHED", "assignerShortName": "palo_alto", "dateReserved": "2025-11-03T20:44:58.173Z", "datePublished": "2026-05-06T18:57:39.876Z", "dateUpdated": "2026-05-06T19:24:13.881Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0", "shortName": "palo_alto", "dateUpdated": "2026-05-06T19:24:13.881Z"}, "title": "PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID\u2122 Authentication Portal", "datePublic": "2026-05-05T23:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-787", "description": "CWE-787: Out-of-bounds Write", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-100", "descriptions": [{"lang": "en", "value": "CAPEC-100 Overflow Buffers"}]}], "affected": [{"vendor": "Palo Alto Networks", "product": "Cloud NGFW", "versions": 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true, "criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionStartIncluding": "12.1.0", "versionEndExcluding": "12.1.7_12.1.4-h5"}, {"vulnerable": true, "criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.2.0", "versionEndExcluding": "11.2.12_11.2.10-h6_11.2.7-h13_11.2.4-h17"}, {"vulnerable": true, "criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.1.0", "versionEndExcluding": "11.1.15_11.1.13-h5_11.1.10-h25_11.1.7-h6_11.1.6-h32_11.1.4-h33"}, {"vulnerable": true, "criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.2.0", "versionEndExcluding": "10.2.18-h6_10.2.16-h7_10.2.13-h21_10.2.10-h36_10.2.7-h34"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:a:palo_alto_networks:prisma_access:all:*:*:*:*:*:*:*"}]}]}], "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in the User-ID\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. \n\nThe risk of this issue is greatly reduced if you secure access to the User-ID\u2122 Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses.\n\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>A buffer overflow vulnerability in the User-ID\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. <br><br>The risk of this issue is greatly reduced if you secure access to the User-ID\u2122 Authentication Portal per the <a target=\"_blank\" rel=\"nofollow\" href=\"https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC\">best practice guidelines</a> by restricting access to only trusted internal IP addresses.<br><br>Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability. </p>"}]}], "references": [{"url": "https://security.paloaltonetworks.com/CVE-2026-0300", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "The risk is highest when you configure the User-ID\u2122 Authentication Portal to enable access from the Internet or any untrusted network."}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "ATTACKED", "Safety": "NOT_DEFINED", "Automatable": "YES", "Recovery": "USER", "valueDensity": "CONCENTRATED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "RED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "You can greatly reduce the risk of exploitation by restricting User-ID\u2122 Authentication Portal access to only trusted internal IP addresses and preventing its exposure to the internet."}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "ATTACKED", "Safety": "NOT_DEFINED", "Automatable": "YES", "Recovery": "USER", "valueDensity": "CONCENTRATED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "RED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red"}}], "configurations": [{"lang": "eng", "value": "This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID\u2122 Authentication Portal.\n\nCustomers are impacted if both of the following conditions are true:\n\n\n * User-ID\u2122 Authentication Portal configured in the User-ID\u2122 Authentication Portal Settings page. You can verify the configuration by going to Device > User Identification > Authentication Portal Settings -> Enable Authentication Portal (applies to both transparent and redirect modes) and\n * An interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network > Interface > Select the interface > Advanced Tab > Create Management Interface Profile.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID\u2122 Authentication Portal.<br><br>Customers are impacted if both of the following conditions are true:<br></p><ul><li>User-ID\u2122 Authentication Portal configured in the User-ID\u2122 Authentication Portal Settings page. You can verify the configuration by going to Device &gt; User Identification &gt; Authentication Portal Settings -&gt; Enable Authentication Portal (applies to both transparent and redirect modes) <b>and</b></li><li>An interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network &gt; Interface &gt; Select the interface &gt; Advanced Tab &gt; Create Management Interface Profile.<br></li></ul><p></p>"}]}], "workarounds": [{"lang": "eng", "value": "Customers can mitigate the risk of this issue by taking either of the following actions:\n * Restrict User-ID\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users' browsers ingress. Refer to Step 6 of the following Live Community article https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286 and Knowledgebase article https://knowledgebase.paloaltonetworks.com/KCSArticleDetail for steps to restrict access.\n\n * Disable User-ID\u2122 Authentication Portal if not required.\n\n\n\nCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID\u00a0510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Customers can mitigate the risk of this issue by taking either of the following actions:<br><ul><li>Restrict User-ID\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users' browsers ingress. Refer to Step 6 of the following <a target=\"_blank\" rel=\"nofollow\" href=\"https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286\">Live Community article</a> and <a target=\"_blank\" rel=\"nofollow\" href=\"https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC\">Knowledgebase article</a> for steps to restrict access.<br></li><li>Disable User-ID\u2122 Authentication Portal if not required.<br></li></ul>Customers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID&nbsp;510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support."}]}], "solutions": [{"lang": "eng", "value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.\n\nWe strongly recommend that you secure access to your User-ID\u2122 Authentication Portal following the instructions in the workarounds section below.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "This issue will be fixed in upcoming releases of PAN-OS as captured in the table above.<br><br>We strongly recommend that you secure access to your User-ID\u2122 Authentication Portal following the instructions in the workarounds section below."}]}], "exploits": [{"lang": "en", "value": "Limited exploitation has been observed targeting Palo Alto Networks User-ID\u2122 Authentication Portals that are exposed to untrusted IP addresses and/or the public internet. Customers following standard security best practices, such as restricting sensitive portals to trusted internal networks are at a greatly reduced risk.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Limited exploitation has been observed targeting Palo Alto Networks User-ID\u2122 Authentication Portals that are exposed to untrusted IP addresses and/or the public internet. Customers following standard security best practices, such as restricting sensitive portals to trusted internal networks are at a greatly reduced risk."}]}], "timeline": [{"time": "2026-05-06T17:27:00.000Z", "lang": "en", "value": "Updated with Threat Prevention ID and clarified the Required Configuration section."}, {"time": "2026-05-05T23:00:00.000Z", "lang": "en", "value": "Initial publication."}], "source": {"discovery": "USER"}, "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"references": [{"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300", "tags": ["government-resource"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-06T19:11:13.428974Z", "id": "CVE-2026-0300", "options": [{"Exploitation": "active"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-06T19:12:10.417Z"}}]}}

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Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users' browsers ingress. Refer to Step 6 of the following Live Community article https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286 and Knowledgebase article https://knowledgebase.paloaltonetworks.com/KCSArticleDetail for steps to restrict access.\n\n * Disable User-ID\u2122 Authentication Portal if not required.\n\n\n\nCustomers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID\u00a0510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support.", "supportingMedia": [{"type": "text/html", "value": "Customers can mitigate the risk of this issue by taking either of the following actions:<br><ul><li>Restrict User-ID\u2122 Authentication Portal access to only trusted zones and in addition, disable Response Pages in the Interface Management Profile attached to every L3 interface in any zone where untrusted/internet traffic can ingress. Keep Response Pages enabled only on interfaces in trust/internal zones where legitimate users' browsers ingress. Refer to Step 6 of the following <a target=\"_blank\" rel=\"nofollow\" href=\"https://live.paloaltonetworks.com/t5/general-articles/why-it-s-essential-to-secure-your-management-interface/ta-p/1001286\">Live Community article</a> and <a target=\"_blank\" rel=\"nofollow\" href=\"https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC\">Knowledgebase article</a> for steps to restrict access.<br></li><li>Disable User-ID\u2122 Authentication Portal if not required.<br></li></ul>Customers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID&nbsp;510019 from Applications and Threats content version 9097-10022. Decoder capabilities necessitate PAN-OS 11.1 or a later version for Threat ID support.", "base64": false}]}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}, "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in the User-ID\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. \n\nThe risk of this issue is greatly reduced if you secure access to the User-ID\u2122 Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses.\n\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.", "supportingMedia": [{"type": "text/html", "value": "<p>A buffer overflow vulnerability in the User-ID\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. <br><br>The risk of this issue is greatly reduced if you secure access to the User-ID\u2122 Authentication Portal per the <a target=\"_blank\" rel=\"nofollow\" href=\"https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000CqbiCAC\">best practice guidelines</a> by restricting access to only trusted internal IP addresses.<br><br>Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability. </p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787: Out-of-bounds Write"}]}], "configurations": [{"lang": "eng", "value": "This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID\u2122 Authentication Portal.\n\nCustomers are impacted if both of the following conditions are true:\n\n\n * User-ID\u2122 Authentication Portal configured in the User-ID\u2122 Authentication Portal Settings page. You can verify the configuration by going to Device > User Identification > Authentication Portal Settings -> Enable Authentication Portal (applies to both transparent and redirect modes) and\n * An interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network > Interface > Select the interface > Advanced Tab > Create Management Interface Profile.", "supportingMedia": [{"type": "text/html", "value": "<p>This issue is applicable only to PA-Series and VM-Series firewalls that are configured to use User-ID\u2122 Authentication Portal.<br><br>Customers are impacted if both of the following conditions are true:<br></p><ul><li>User-ID\u2122 Authentication Portal configured in the User-ID\u2122 Authentication Portal Settings page. You can verify the configuration by going to Device &gt; User Identification &gt; Authentication Portal Settings -&gt; Enable Authentication Portal (applies to both transparent and redirect modes) <b>and</b></li><li>An interface management profile with response pages enabled and associated with an external/internet-accessible interface. You can verify the configuration by going to Network &gt; Interface &gt; Select the interface &gt; Advanced Tab &gt; Create Management Interface Profile.<br></li></ul><p></p>", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:palo_alto_networks:cloud_ngfw:all:*:*:*:*:*:*:*", "vulnerable": false}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "12.1.7_12.1.4-h5", "versionStartIncluding": "12.1.0"}, {"criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "11.2.12_11.2.10-h6_11.2.7-h13_11.2.4-h17", "versionStartIncluding": "11.2.0"}, {"criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "11.1.15_11.1.13-h5_11.1.10-h25_11.1.7-h6_11.1.6-h32_11.1.4-h33", "versionStartIncluding": "11.1.0"}, {"criteria": "cpe:2.3:a:palo_alto_networks:pan-os:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "10.2.18-h6_10.2.16-h7_10.2.13-h21_10.2.10-h36_10.2.7-h34", "versionStartIncluding": "10.2.0"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:palo_alto_networks:prisma_access:all:*:*:*:*:*:*:*", "vulnerable": false}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0", "shortName": "palo_alto", "dateUpdated": "2026-05-06T19:24:13.881Z"}}}, "cveMetadata": {"cveId": "CVE-2026-0300", "state": "PUBLISHED", "dateUpdated": "2026-05-06T19:24:13.881Z", "dateReserved": "2025-11-03T20:44:58.173Z", "assignerOrgId": "d6c1279f-00f6-4ef7-9217-f89ffe703ec0", "datePublished": "2026-05-06T18:57:39.876Z", "assignerShortName": "palo_alto"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in the User-ID\u2122 Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. \n\nThe risk of this issue is greatly reduced if you secure access to the User-ID\u2122 Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses.\n\nPrisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability."}], "id": "CVE-2026-0300", "lastModified": "2026-05-06T20:16:30.867", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "ATTACKED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "RED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "CONCENTRATED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:C/RE:M/U:Red", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "MODERATE"}, "source": "psirt@paloaltonetworks.com", "type": "Secondary"}]}, "published": "2026-05-06T19:16:35.730", "references": [{"source": "psirt@paloaltonetworks.com", "url": "https://security.paloaltonetworks.com/CVE-2026-0300"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300"}], "sourceIdentifier": "psirt@paloaltonetworks.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "psirt@paloaltonetworks.com", "type": "Secondary"}]}

{}

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