Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Cxf | < 4.1.7 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/s83t3x4r626o9h8rt0ryr1w7w53l1vv8Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/06/11/8Mailing ListThird Party Advisory
FAQ
What is CVE-2026-50631?
CVE-2026-50631 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 'recycleRefreshToke...
How severe is CVE-2026-50631?
CVE-2026-50631 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-50631?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Cxf.