CVE-2026-50627

Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator

State: Published
Severity: 9.1 Critical
Published: Jun 12, 2026
Updated: Aug 10, 2026
Reserved: Jun 5, 2026

Description

The JwtAccessTokenValidator class in Apache CXF fails to validate the 'aud' (Audience) claims of incoming JWT access tokens. This allows a JWT issued for one Resource Server to be successfully replayed against a completely different Resource Server, leading to Token Confusion/Routing attacks. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	CISA-ADP
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	redhat-SADP

Weaknesses

CWE-289 Authentication Bypass by Alternate Name
CWE-303 Incorrect Implementation of Authentication Algorithm

Affected Products

Product	Versions
Apache CXFApache Software Foundation	4.2.0 to before 4.2.2Affected 4.0.0 to before 4.1.7Affected before 3.6.12Affected

References

https://lists.apache.org/thread/0jfzz9q992957b99tw7hodcqjfyxwb1mvendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/11/4
https://access.redhat.com/security/cve/CVE-2026-50627vdb-entry
RHBZ#2488298issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50627.json
https://access.redhat.com/errata/RHSA-2026:37390vendor-advisory

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