CVE-2026-50627 Apache CXF: OAuth2: Missing JWT Audience and Issuer Validation in Access Token Validator
Attackers can replay JWTs across different resource servers due to missing audience validation, bypassing authentication controls in Apache CXF.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50627?
CVE-2026-50627 is a critical authentication bypass vulnerability in Apache Cxf, published on 12 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Which versions are affected by CVE-2026-50627?
4 open source packages ship an affected version, including org.apache.cxf:cxf-rt-rs-security-oauth2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.cxf:cxf-rt-rs-security-oauth2 Maven | All versions | 4.1.7 |
org.apache.cxf:cxf-rt-rs-security-oauth2 Maven | All versions | 4.1.7 |
org.apache.cxf:cxf-rt-rs-security-oauth2 Maven | From 4.2.0 | 4.2.2 |
org.apache.cxf:cxf-rt-rs-security-oauth2 Maven | From 4.2.0 | 4.2.2 |
Products include Apache Cxf.
How do I fix CVE-2026-50627?
Upgrade org.apache.cxf:cxf-rt-rs-security-oauth2 to a fixed version for your release line: 4.1.7 or 4.2.2.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-50627 being exploited?
There is no known exploitation of CVE-2026-50627 in the wild and no public exploit code.
Other vulnerabilities in Apache Cxf
- CVE-2012-2379 XML Signature/Encryption Not Validated in Apache CXF
- CVE-2026-66909 Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage
- CVE-2026-68079 Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay
- CVE-2026-50628 Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control
- CVE-2025-48913 Apache CXF: Untrusted JMS configuration can lead to RCE
Sources
Also known as GHSA-9mrv-8pvf-hf4m.