{"id":"CVE-2026-6647","revision":null,"records":[{"revision":"657d891d058c4d06b70427a3201b8301","observedAt":"2026-10-29T03:48:01.066+00:00","statement":{"source":"cve-program","id":"CVE-2026-6647","aliases":[],"title":"Incomplete OAuth Token Revocation via Case Mismatch in WSO2 Identity Server Allows Continued Access After Lifecycle Events","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.","state":0,"publishedAt":"2026-10-28T19:21:35.702+00:00","modifiedAt":"2026-10-29T02:02:13.994+00:00","affected":[{"ecosystem":"Vendor product","name":"WSO2 Identity Server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"WSO2\",\n                    \"product\": \"WSO2 Identity Server\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"7.2.0\",\n                            \"lessThan\": \"7.2.0.21\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"},{"ecosystem":"Vendor product","name":"org.wso2.carbon.identity.inbound.auth.oauth2:org.wso2.carbon.identity.oauth","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"WSO2\",\n                    \"product\": \"WSO2 Carbon OAuth\",\n                    \"packageName\": \"org.wso2.carbon.identity.inbound.auth.oauth2:org.wso2.carbon.identity.oauth\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"7.0.385\",\n                            \"lessThan\": \"7.0.385.17\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"7.5.23\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"versionType\": \"custom\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unknown\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","score":7.4,"severity":"HIGH"}],"references":["https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5387/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6647","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-6647","identifiers":["CVE-2026-6647"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-a62e0f5120334284beb3f9889cd2a2da","complete":true,"records":13631,"lastAttemptAt":"2026-11-07T08:37:59.5911353+00:00","lastSuccessAt":"2026-11-07T08:37:59.587+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:37:59.587+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-07T08:26:54.7587124+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T08:26:54.7587124+00:00","lastSuccessAt":"2026-11-07T08:26:54.9369587+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.9369591+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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