Vulnerability Description
An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/services/oauth2/introspect) can be accessed by any unauthenticated network attacker. However note that this is a safeguard only in the case that someone forgot to enable authentication on the service. Users are recommended to upgrade to version 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Cxf | < 4.1.7 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/06/11/3Mailing ListThird Party Advisory
FAQ
What is CVE-2026-50623?
CVE-2026-50623 is a vulnerability with a CVSS score of 4.8 (MEDIUM). An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/servic...
How severe is CVE-2026-50623?
CVE-2026-50623 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-50623?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Cxf.