CVE-2026-50631

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.

Score

CVSS 3.1 7.4 High

Status

Modified - security@apache.org

Published

2026-06-12

Last modified

2026-10-26

Weaknesses

CWE-367

Affected products

• Cxf (Apache)
• Apache Cxf (Apache Software Foundation)

References

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