Critical severity · published Jun 12, 2026
CVE-2026-50627
Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator
9.1
CVSS
4.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)4.5% · higher than 91% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CXF · Apache Software Foundation
4.2.0 before 4.2.2; 4.0.0 before 4.1.7; before 3.6.12 · source: vendor
CX
Cxf · Apache
before 4.1.7; 4.2.0 before 4.2.2 · source: NVD
RH
Red Hat Fuse 7 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Web Server 5 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50627
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50627
Vendor Advisory
https://lists.apache.org/thread/0jfzz9q992957b99tw7hodcqjfyxwb1m
Mailing List
http://www.openwall.com/lists/oss-security/2026/06/11/4
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:37390
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-50627
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2488298
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50627.json
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