Advisory [CVE-2026-50631] Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
This security Apache Software Foundation advisory covers CVE-2026-50631 affecting Apache CXF.
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Summary
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.
Affected product named by the advisory: Apache CXF.
- Apache CXF 4.2.0 before 4.2.2
- Apache CXF 4.0.0 before 4.1.7
- Apache CXF before 3.6.12
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
- 4.2.2
- 4.1.7
- 3.6.12
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
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