CVE-2026-50623: CWE-287 Improper Authentication in Apache Software Foundation Apache CXF
CVE-2026-50623 is an authentication bypass vulnerability in Apache CXF's OAuth2 TokenIntrospectionService. The flaw is due to a missing 'throw' keyword in the security context check, allowing unauthenticated access to the introspection endpoint if authentication is not enabled. The issue is fixed in Apache CXF versions 4.2.2, 4.1.7, and 3.6.12. The vulnerability has a medium severity with a CVSS score of 4.8.
AI Analysis
Technical Summary
An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService of Apache CXF caused by a missing 'throw' keyword in the security context check. This allows any unauthenticated network attacker to access the introspection endpoint (/services/oauth2/introspect) if authentication is not enabled on the service. This vulnerability is a safeguard bypass rather than a direct flaw in enabled authentication. Users are advised to upgrade to Apache CXF versions 4.2.2, 4.1.7, or 3.6.12 where this issue is fixed.
Potential Impact
The vulnerability allows unauthenticated attackers to access the OAuth2 token introspection endpoint if authentication is not enabled on the service. This could lead to unauthorized token introspection, potentially exposing sensitive token information. However, the vulnerability only applies if authentication is not properly configured, limiting its impact. The CVSS score of 4.8 reflects a medium severity with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Users should upgrade Apache CXF to versions 4.2.2, 4.1.7, or 3.6.12 where the missing 'throw' keyword issue is fixed. Ensuring that authentication is properly enabled on the OAuth2 TokenIntrospectionService also mitigates the risk. Patch status is confirmed by the vendor advisory recommending these versions.
CVE-2026-50623: CWE-287 Improper Authentication in Apache Software Foundation Apache CXF
Description
CVE-2026-50623 is an authentication bypass vulnerability in Apache CXF's OAuth2 TokenIntrospectionService. The flaw is due to a missing 'throw' keyword in the security context check, allowing unauthenticated access to the introspection endpoint if authentication is not enabled. The issue is fixed in Apache CXF versions 4.2.2, 4.1.7, and 3.6.12. The vulnerability has a medium severity with a CVSS score of 4.8.
CVSS v3.1
Score 4.8medium
Affected software
Apache Software Foundation
Apache CXF
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 exists in the OAuth2 TokenIntrospectionService of Apache CXF caused by a missing 'throw' keyword in the security context check. This allows any unauthenticated network attacker to access the introspection endpoint (/services/oauth2/introspect) if authentication is not enabled on the service. This vulnerability is a safeguard bypass rather than a direct flaw in enabled authentication. Users are advised to upgrade to Apache CXF versions 4.2.2, 4.1.7, or 3.6.12 where this issue is fixed.
Potential Impact
The vulnerability allows unauthenticated attackers to access the OAuth2 token introspection endpoint if authentication is not enabled on the service. This could lead to unauthorized token introspection, potentially exposing sensitive token information. However, the vulnerability only applies if authentication is not properly configured, limiting its impact. The CVSS score of 4.8 reflects a medium severity with low confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
Users should upgrade Apache CXF to versions 4.2.2, 4.1.7, or 3.6.12 where the missing 'throw' keyword issue is fixed. Ensuring that authentication is properly enabled on the OAuth2 TokenIntrospectionService also mitigates the risk. Patch status is confirmed by the vendor advisory recommending these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-06-05T10:20:37.692Z
- State
- PUBLISHED
Threat ID: 6a2bd75be617e2d83448bfaa
Added to database: 06/12/2026, 09:54:35 UTC
Last enriched: 08/14/2026, 16:23:12 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 178
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.