{"id":"CVE-2026-6647","aliases":[],"cve":{"records":[{"id":"CVE-2026-6647","source":"WSO2","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-04-20T05:10:27.014Z","published":"2026-10-28T19:21:35.702Z","modified":"2026-10-29T02:02:13.994Z"}],"publishers":[{"name":"WSO2","role":"CNA","organizationId":"ed10eef1-636d-4fbe-9993-6890dfa878f8","modified":"2026-10-28T19:21:35.702Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T02:02:13.994Z"}],"references":[{"url":"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5387/","tags":["vendor-advisory"],"source":"WSO2"}],"weaknesses":[{"id":"CWE-613","description":"CWE-613 Insufficient session expiration","source":"WSO2"}],"applicability":[{"source":"WSO2","statements":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:wso2:wso2_identity_server:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2.0","versionEndExcluding":"7.2.0.21"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:wso2:wso2_carbon_oauth:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.385","versionEndExcluding":"7.0.385.17"},{"vulnerable":false,"criteria":"cpe:2.3:a:wso2:wso2_carbon_oauth:*:*:*:*:*:*:*:*","versionStartIncluding":"7.5.23","versionEndIncluding":"*"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T01:51:34.435159Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Incomplete OAuth Token Revocation via Case Mismatch in WSO2 Identity Server Allows Continued Access After Lifecycle Events","titleSource":"WSO2","descriptionSource":"WSO2","description":"In deployments of WSO2 Identity Server configured with a case-insensitive user store and a case-sensitive database for identity data, mismatches in username case handling can occur. This inconsistency results in OAuth token revocation operations failing to correctly identify usernames containing mixed-case characters during certain lifecycle events, preventing tokens from being invalidated.\n\nA malicious actor can exploit this vulnerability by possessing a valid access or refresh token associated with a mixed-case username. In affected configurations, these tokens may not be revoked when expected. The actor can then leverage these unrevoked tokens, before their expiry, to continue performing actions that should have been restricted, effectively bypassing intended access controls.","score":7.4,"severity":"high","published":"2026-10-28T19:21:35.702Z","modified":"2026-10-29T02:02:13.994Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"WSO2","name":"WSO2 Identity Server","platforms":[],"versions":[{"version":"7.2.0","status":"affected","lessThan":"7.2.0.21","versionType":"custom"}],"defaultStatus":"unaffected","cpes":[],"source":"WSO2","url":"https://www.cve.org/CVERecord?id=CVE-2026-6647"},{"vendor":"WSO2","name":"WSO2 Carbon OAuth","platforms":[],"versions":[{"version":"7.0.385","status":"affected","lessThan":"7.0.385.17","versionType":"custom"},{"version":"7.5.23","status":"unaffected","lessThanOrEqual":"*","versionType":"custom"}],"defaultStatus":"unknown","cpes":[],"source":"WSO2","url":"https://www.cve.org/CVERecord?id=CVE-2026-6647"}],"remediation":[{"text":"Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5387/#solution","source":"WSO2","url":"https://www.cve.org/CVERecord?id=CVE-2026-6647"}],"references":["https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5387/"],"sources":[{"name":"CVE","id":"CVE-2026-6647","modified":"2026-10-29T02:02:13.994Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-6647"}],"assessments":[{"source":"WSO2","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","score":7.4}],"sourceAffected":[],"observedAt":"2026-10-29T14:42:30.162Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T13:10:31.620Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T02:45:38.985Z","attemptedAt":"2026-10-29T02:45:38.985Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T02:45:36.494Z","attemptedAt":"2026-10-29T02:45:36.494Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T02:45:36.977Z","attemptedAt":"2026-10-29T02:45:36.977Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-29T02:45:35.020Z","attemptedAt":"2026-10-29T02:45:35.020Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-rxrw-f2xj-7fjx","url":"https://github.com/advisories/GHSA-rxrw-f2xj-7fjx","modified":"2026-10-28T21:31:26Z","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","checkedAt":"2026-10-29T02:45:36.494Z"},{"source":"ENISA EUVD","id":"EUVD-2026-112401","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112401","modified":"Oct 28, 2026, 7:21:35 PM","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","checkedAt":"2026-10-29T02:45:36.977Z"},{"source":"NVD","id":"CVE-2026-6647","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6647","modified":"2026-10-28T20:18:44.080","score":7.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","checkedAt":"2026-10-29T02:45:38.985Z"}],"aiSummary":{"text":"WSO2 Identity Server versions 7.2.0 to 7.2.0.20 and WSO2 Carbon OAuth versions 7.0.385 to 7.0.385.16 are affected by a vulnerability where OAuth token revocation fails due to case mismatches in usernames, allowing continued access after lifecycle events. A malicious actor with a valid access or refresh token can exploit this. The vulnerability occurs in deployments with case-insensitive user stores and case-sensitive databases.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:40:16.142Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-6647"}]}}