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.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7 Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 4.8 · apacheNVD modified 2026-10-25 23:10
Affected (CPE criteria) 1
cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*
References 2
- https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7 Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/06/11/3 Mailing List, Third Party Advisory