{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23901", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-01-17T18:01:53.140Z", "datePublished": "2026-02-10T09:25:51.765Z", "dateUpdated": "2026-02-10T10:22:44.721Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.shiro:shiro-core", "product": "Apache Shiro", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "2.0.7", "status": "affected", "version": "0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "4ra1n"}, {"lang": "en", "type": "finder", "value": "Y4tacker"}, {"lang": "en", "type": "remediation developer", "value": "lprimak"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Observable Timing Discrepancy vulnerability in Apache Shiro.</p><p>This issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.</p><p>Users are recommended to upgrade to version 2.0.7 or later, which fixes the issue.</p>Prior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,<br>that a brute-force attack may be able to tell, by timing the requests only, determine if<br>the request failed because of a non-existent user vs. wrong password.<br><br>The most likely attack vector is a local attack only.<br>Shiro security model&nbsp;<a target=\"_blank\" rel=\"nofollow\" href=\"https://shiro.apache.org/security-model.html#username_enumeration\">https://shiro.apache.org/security-model.html#username_enumeration</a>&nbsp;discusses this as well.<br><br>Typically, brute force attack can be mitigated at the infrastructure level."}], "value": "Observable Timing Discrepancy vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7 or later, which fixes the issue.\n\nPrior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,\nthat a brute-force attack may be able to tell, by timing the requests only, determine if\nthe request failed because of a non-existent user vs. wrong password.\n\nThe most likely attack vector is a local attack only.\nShiro security model\u00a0 https://shiro.apache.org/security-model.html#username_enumeration \u00a0discusses this as well.\n\nTypically, brute force attack can be mitigated at the infrastructure level."}], "metrics": [{"cvssV4_0": {"Automatable": "YES", "Recovery": "AUTOMATIC", "Safety": "NEGLIGIBLE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 1, "baseSeverity": "LOW", "privilegesRequired": "LOW", "providerUrgency": "GREEN", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "CONCENTRATED", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/AU:Y/R:A/V:C/RE:L/U:Green", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "LOW"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"other": {"content": {"text": "low"}, "type": "Textual description of severity"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-208", "description": "CWE-208 Observable Timing Discrepancy", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-02-10T09:25:51.765Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://lists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhh"}], "source": {"discovery": "UNKNOWN"}, "title": "Apache Shiro: Brute force attack possible to determine valid user names", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/02/08/2"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-02-10T10:22:44.721Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Observable Timing Discrepancy vulnerability in Apache Shiro.\n\nThis issue affects Apache Shiro: from 1.*, 2.* before 2.0.7.\n\nUsers are recommended to upgrade to version 2.0.7 or later, which fixes the issue.\n\nPrior to Shiro 2.0.7, code paths for non-existent vs. existing users are different enough,\nthat a brute-force attack may be able to tell, by timing the requests only, determine if\nthe request failed because of a non-existent user vs. wrong password.\n\nThe most likely attack vector is a local attack only.\nShiro security model\u00a0 https://shiro.apache.org/security-model.html#username_enumeration \u00a0discusses this as well.\n\nTypically, brute force attack can be mitigated at the infrastructure level."}], "id": "CVE-2026-23901", "lastModified": "2026-02-10T10:15:59.240", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "AUTOMATIC", "Safety": "NEGLIGIBLE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 1.0, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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": "LOW", "providerUrgency": "GREEN", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "CONCENTRATED", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/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:N/AU:Y/R:A/V:C/RE:L/U:Green", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "LOW"}, "source": "security@apache.org", "type": "Secondary"}]}, "published": "2026-02-10T10:15:59.240", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/mm1jct9b86jvnh3y44tj22xvjtx3xhhh"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-208"}], "source": "security@apache.org", "type": "Primary"}]}

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