Apache CXF OAuth2 Missing JWT Audience and Issuer Validation in Access Token Validator
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, which fixes this issue.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.cxf:cxf-rt-rs-security-oauth2 | >= 4.2.0, < 4.2.2, < 4.1.7 | 4.2.2, 4.1.7 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-50627
- https://access.redhat.com/errata/RHSA-2026:37390
- https://access.redhat.com/security/cve/CVE-2026-50627
- https://bugzilla.redhat.com/show_bug.cgi?id=2488298
- https://github.com/apache/cxf
- https://lists.apache.org/thread/0jfzz9q992957b99tw7hodcqjfyxwb1m
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50627.json
- http://www.openwall.com/lists/oss-security/2026/06/11/4
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-289, CWE-303- Platform
- Java / Kotlin (Maven)
- Package
org.apache.cxf:cxf-rt-rs-security-oauth2- Disclosed
- 12.06.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-9mrv-8pvf-hf4m - CC BY 4.0
Vulnerability history: org.apache.cxf:cxf-rt-rs-security-oauth2
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 2
- Medium 2
Disclosures per year
- 2026: 6
-
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