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CVE-2026-50631 A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass…

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 or 3.6.12, which fixes this issue.

Affected products and versions

Product Affected versions Fixed in
Apache CXF 4.2 4.2.0 → < 4.2.2 4.2.2
Apache CXF 4.0 4.0.0 → < 4.1.7 4.1.7
Apache CXF 3.6 earliest → < 3.6.12 3.6.12

References

Timeline

  1. Published
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