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Vulnerability · Published Jun 12, 2026 · Assigned by apache

CVE-2026-50627Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator

Critical 9.1

In plain English

A critical-severity security flaw in Apache CXF from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.6% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)4.6%top 8.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.apache.cxf:cxf-rt-rs-security-oauth24.2.2GHSA-9mrv-8pvf-hf4m
Mavenorg.apache.cxf:cxf-rt-rs-security-oauth24.1.7GHSA-9mrv-8pvf-hf4m

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache CXF 4.2.0 – before 4.2.24.0.0 – before 4.1.70 – before 3.6.12

Weakness: CWE-289, CWE-303 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References