apache/cxf · Security
Apache CXF OAuth2 TOCTOU Race Condition in Refresh Token Processing
- GHSA ID
- GHSA-83r6-96m8-r52p
- CVE ID
- CVE-2026-50631
- Severity
- high
- Published
- Updated
- CVSS
- 7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CVSS v3
- 7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
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, which fixes this issue.
CWEs
- CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition