CVE-2026-50631

UNKNOWN 0.0

Apache CXF: OAuth2: TOCTOU Race Condition in Refresh Token Processing

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-367
Vendor	apache software foundation
Product	apache cxf
Published	Jun 12, 2026
Last Updated	Jun 12, 2026

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Affected Versions

Apache Software Foundation / Apache CXF

4.2.0 < 4.2.2 0 < 4.1.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

lists.apache.org: https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8 openwall.com: http://www.openwall.com/lists/oss-security/2026/06/11/8

Credits

Guanping Zhang reported this vulnerability.