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Fencer Vulns
critical 9.1

CVE-2026-50627 in the critical feed json

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

published 2026-06-12 4 mo ago modified 2026-11-05 3 d ago also GHSA-9mrv-8pvf-hf4m , EUVD-2026-36395

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.1%
EPSS 4.1% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.cxf:cxf-rt-rs-security-oauth2 4.1.7, 4.2.2
  • Apache Software Foundation Apache CXF 3.6.12, 4.1.7, 4.2.2
  • Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 oauth2-saml, security-oauth2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-50627 updated cvss 8.1

apache-cxf: org.apache.cxf/cxf-rt-rs-security-oauth2: Apache CXF: Token Confusion/Routing attacks due to improper validation of JWT audience claims

  • Red Hat Fuse 7 cxf-rt-rs-security-oauth2, cxf-rt-rs-security-oauth2-saml Red Hat JBoss Web Server 5 cxf-rt-rs-security-oauth2, cxf-rt-rs-security-oauth2-saml
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:37390
  • Red Hat JBoss Enterprise Application Platform Expansion Pack cxf-rt-rs-security-oauth2, cxf-rt-rs-security-oauth2-saml
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

4.12% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 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 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.cxf:cxf-rt-rs-security-oauth2
>=4.2.0, <4.2.2
<4.1.7
4.2.2
4.1.7

Affected products

  • Apache Software Foundation Apache CXF
  • Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat JBoss Web Server 5

Classification

Weakness
  • CWE-289 Authentication Bypass by Alternate Name
  • CWE-303 Incorrect Implementation of Authentication Algorithm
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.