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
An authentication bypass vulnerability (CWE-287) exists in Apache CXF's OAuth2 TokenIntrospectionService due to a missing 'throw' keyword in the security context validation logic. This flaw allows any unauthenticated network attacker to access the /services/oauth2/introspect endpoint if authentication is not enabled on the service, which is intended as a safeguard. The vulnerability affects Apache CXF version 4.2.0. The vendor recommends upgrading to versions 4.2.2 or 4.1.7 to fix this issue.
Potential Impact
The vulnerability allows unauthenticated attackers to access the OAuth2 token introspection endpoint if authentication is not enabled, potentially exposing token validation information. The CVSS score is 4.8 (medium severity), indicating limited confidentiality and integrity impact with no availability impact. There are no known exploits in the wild.
Mitigation Recommendations
Users should upgrade Apache CXF to version 4.2.2 or 4.1.7, where this vulnerability is fixed. No other official remediation or temporary fixes are documented. Patch status is not explicitly confirmed in the vendor advisory, but the recommended upgrade versions indicate an official fix is available.
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.
CVSS v3.1
Score 4.8medium
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
An authentication bypass vulnerability (CWE-287) exists in Apache CXF's OAuth2 TokenIntrospectionService due to a missing 'throw' keyword in the security context validation logic. This flaw allows any unauthenticated network attacker to access the /services/oauth2/introspect endpoint if authentication is not enabled on the service, which is intended as a safeguard. The vulnerability affects Apache CXF version 4.2.0. The vendor recommends upgrading to versions 4.2.2 or 4.1.7 to fix this issue.
Potential Impact
The vulnerability allows unauthenticated attackers to access the OAuth2 token introspection endpoint if authentication is not enabled, potentially exposing token validation information. The CVSS score is 4.8 (medium severity), indicating limited confidentiality and integrity impact with no availability impact. There are no known exploits in the wild.
Mitigation Recommendations
Users should upgrade Apache CXF to version 4.2.2 or 4.1.7, where this vulnerability is fixed. No other official remediation or temporary fixes are documented. Patch status is not explicitly confirmed in the vendor advisory, but the recommended upgrade versions indicate an official fix is available.
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: 06/12/2026, 09:54:35 UTC
Last enriched: 06/19/2026, 18:10:32 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 113
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