CVE-2026-50623: CWE-287 Improper Authentication in Apache Software Foundation Apache CXF
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.
AI Analysis
Technical Summary
CVE-2026-50623 is an authentication bypass vulnerability in Apache CXF's OAuth2 TokenIntrospectionService. The vulnerability arises from a missing 'throw' keyword in the security context check, which causes the introspection endpoint to be accessible without authentication if the service's authentication is not explicitly enabled. This vulnerability acts as a safeguard failure rather than a direct bypass of an enabled authentication mechanism. Upgrading to Apache CXF versions 4.2.2 or 4.1.7 mitigates this issue.
Potential Impact
Unauthenticated attackers can access the OAuth2 token introspection endpoint if authentication is not enabled on the service, potentially exposing token validation information. However, this vulnerability only applies when authentication is not configured, serving as a safeguard failure rather than a direct bypass of active authentication controls.
Mitigation Recommendations
Users should upgrade Apache CXF to version 4.2.2 or 4.1.7, where this vulnerability is fixed. Ensuring that authentication is properly enabled on the OAuth2 TokenIntrospectionService also mitigates the risk. Patch status is not explicitly confirmed in the advisory, but the vendor recommends upgrading to these fixed versions.
CVE-2026-50623: CWE-287 Improper Authentication in Apache Software Foundation Apache CXF
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.
Affected software
pkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-rs-security-oauth2Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-50623 is an authentication bypass vulnerability in Apache CXF's OAuth2 TokenIntrospectionService. The vulnerability arises from a missing 'throw' keyword in the security context check, which causes the introspection endpoint to be accessible without authentication if the service's authentication is not explicitly enabled. This vulnerability acts as a safeguard failure rather than a direct bypass of an enabled authentication mechanism. Upgrading to Apache CXF versions 4.2.2 or 4.1.7 mitigates this issue.
Potential Impact
Unauthenticated attackers can access the OAuth2 token introspection endpoint if authentication is not enabled on the service, potentially exposing token validation information. However, this vulnerability only applies when authentication is not configured, serving as a safeguard failure rather than a direct bypass of active authentication controls.
Mitigation Recommendations
Users should upgrade Apache CXF to version 4.2.2 or 4.1.7, where this vulnerability is fixed. Ensuring that authentication is properly enabled on the OAuth2 TokenIntrospectionService also mitigates the risk. Patch status is not explicitly confirmed in the advisory, but the vendor recommends upgrading to these fixed versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-06-05T10:20:37.692Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2bd75be617e2d83448bfaa
Added to database: 6/12/2026, 9:54:35 AM
Last enriched: 6/12/2026, 10:10:48 AM
Last updated: 6/12/2026, 12:33:25 PM
Views: 5
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