{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55198", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-16T15:53:37.764Z", "datePublished": "2026-06-17T17:59:25.491Z", "dateUpdated": "2026-06-17T19:30:54.755Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-06-17T17:59:25.491Z"}, "title": "Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint", "descriptions": [{"lang": "en", "value": "Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, enabling attackers to exfiltrate foreign session transcripts by guessing or knowing session identifiers."}], "tags": ["x_open-source"], "datePublic": "2026-06-11T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-639", "description": "Authorization Bypass Through User-Controlled Key", "type": "CWE"}]}], "affected": [{"vendor": "nesquena", "product": "hermes-webui", "defaultStatus": "unaffected", "packageURL": "pkg:npm/hermes-webui-devtools", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "0.51.443"}, {"version": "0.51.443", "status": "unaffected", "versionType": "semver"}], "repo": "https://github.com/nesquena/hermes-webui"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.1, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}}], "references": [{"url": "https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443", "name": "Release Notes", "tags": ["release-notes"]}, {"url": "https://github.com/nesquena/hermes-webui/pull/3991", "name": "Researcher Pull Request", "tags": ["technical-description"]}, {"url": "https://github.com/nesquena/hermes-webui/pull/4269", "name": "Maintainer Pull Request", "tags": ["issue-tracking"]}, {"url": "https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71", "name": "Patch Commit", "tags": ["patch"]}, {"url": "https://www.vulncheck.com/advisories/hermes-webui-cross-profile-session-data-exfiltration-via-session-export-endpoint", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "Chia Min Jun Lennon", "type": "finder"}], "x_generator": {"engine": "vulncheck"}}, "adp": [{"references": [{"url": "https://github.com/nesquena/hermes-webui/pull/3991", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-17T19:30:06.299958Z", "id": "CVE-2026-55198", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-17T19:30:54.755Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55198", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-16T15:53:37.764Z", "datePublished": "2026-06-17T17:59:25.491Z", "dateUpdated": "2026-06-17T19:30:54.755Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-06-17T17:59:25.491Z"}, "title": "Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint", "descriptions": [{"lang": "en", "value": "Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, enabling attackers to exfiltrate foreign session transcripts by guessing or knowing session identifiers."}], "tags": ["x_open-source"], "datePublic": "2026-06-11T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-639", "description": "Authorization Bypass Through User-Controlled Key", "type": "CWE"}]}], "affected": [{"vendor": "nesquena", "product": "hermes-webui", "defaultStatus": "unaffected", "packageURL": "pkg:npm/hermes-webui-devtools", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "0.51.443"}, {"version": "0.51.443", "status": "unaffected", "versionType": "semver"}], "repo": "https://github.com/nesquena/hermes-webui"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.1, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}}], "references": [{"url": "https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443", "name": "Release Notes", "tags": ["release-notes"]}, {"url": "https://github.com/nesquena/hermes-webui/pull/3991", "name": "Researcher Pull Request", "tags": ["technical-description"]}, {"url": "https://github.com/nesquena/hermes-webui/pull/4269", "name": "Maintainer Pull Request", "tags": ["issue-tracking"]}, {"url": "https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71", "name": "Patch Commit", "tags": ["patch"]}, {"url": "https://www.vulncheck.com/advisories/hermes-webui-cross-profile-session-data-exfiltration-via-session-export-endpoint", "tags": ["third-party-advisory"]}], "credits": [{"lang": "en", "value": "Chia Min Jun Lennon", "type": "finder"}], "x_generator": {"engine": "vulncheck"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55198", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-17T19:30:06.299958Z"}}}], "references": [{"url": "https://github.com/nesquena/hermes-webui/pull/3991", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-17T19:30:48.718Z"}}]}}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,0.51.443)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "0.51.443"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "hermes-webui", "source": "cna", "vendor": "nesquena"}, "product": "hermes-webui", "vendor": "nesquena"}], "created": "2026-06-18T20:30:05.125509+00:00", "updated": "2026-06-18T20:45:03.337566+00:00", "vendors": ["nesquena", "nesquena$PRODUCT$hermes-webui"]}