Severity: moderate Affected versions:
- Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) 4.2.0 before 4.2.2 - Apache CXF (org.apache.cxf:cxf-rt-rs-security-oauth2) before 4.1.7 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, which fixes this issue. Credit: Guanping Zhang reported this vulnerability. (finder) References: https://cxf.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-50623
