CVE-2026-50631 — Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing
A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and generate multiple valid Access Tokens, w…
Published: 2026-06-12 · CVSS: 7.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7