Advisory [CVE-2026-50623] Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService
This security Apache Software Foundation advisory covers CVE-2026-50623 affecting Apache CXF.
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Summary
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.
- Apache CXF 4.2.0 before 4.2.2
- Apache CXF 4.0.0 before 4.1.7
- Apache CXF before 3.6.12
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
- 4.2.2
- 4.1.7
- 3.6.12
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
Mitigation checklist
- 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.
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
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