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Fencer Intel
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 4mo ago modified 6d ago also EUVD-2026-36395 , GHSA-9mrv-8pvf-hf4m

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

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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
4mo ago

Exploit prediction

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

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
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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

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 Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.