Auth Bypass via Missing Throw in Apache CXF OAuth2 Introspection <4.2.2
CVE-2026-50623 Published on June 12, 2026
Apache CXF: Authentication Bypass in OAuth2 TokenIntrospectionService
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.
Vulnerability Analysis
CVE-2026-50623 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-50623 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-50623
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Affected Versions
Apache Software Foundation Apache CXF:- Version 4.2.0 and below 4.2.2 is affected.
- Before 4.1.7 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.