{"id":"CVE-2026-50631","aliases":["GHSA-83r6-96m8-r52p"],"url":"https://o3.security/vulnerability/CVE-2026-50631","summary":"Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing","details":"A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, when 'recycleRefreshTokens' is set to false. A leaked refresh token can be replayed concurrently by multiple attackers or threads. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.","published":"2026-06-12T08:59:40.200Z","modified":"2026-08-20T18:48:08.279103148Z","cvss":{"score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.cxf:cxf-rt-rs-security-oauth2","fixedVersion":"4.2.2"},{"ecosystem":"Maven","name":"org.apache.cxf:cxf-rt-rs-security-oauth2","fixedVersion":"4.1.7"}],"fix":null,"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/11/8"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50631.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50631"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-20T18:48:08.279103148Z"}}