CVE-2026-50630 Apache CXF: OAuth2: HTTP Response Splitting via WWW-Authenticate Realm Injection

What is CVE-2026-50630?

CVE-2026-50630 is a medium-severity vulnerability in Apache Cxf, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A CRLF injection vulnerability exists in the OAuth2 AuthorizationUtils class. When constructing the WWW-Authenticate response header, the 'realm' parameter is concatenated without sanitizing Carriage Return (CR) and Line Feed (LF) characters. If an attacker can control the realm value, they can inject arbitrary HTTP headers or split the HTTP response entirely. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

Weakness: CWE-113

Which versions are affected by CVE-2026-50630?

4 open source packages ship an affected version, including org.apache.cxf:cxf-rt-rs-security-oauth2. It affects 1 product.

Products include Apache Cxf.

How do I fix CVE-2026-50630?

Upgrade org.apache.cxf:cxf-rt-rs-security-oauth2 to a fixed version for your release line: 4.1.7 or 4.2.2.

Is CVE-2026-50630 being exploited?

There is no known exploitation of CVE-2026-50630 in the wild and no public exploit code.

Other vulnerabilities in Apache Cxf

• CVE-2012-2379 XML Signature/Encryption Not Validated in Apache CXF Critical 10.0
• CVE-2026-66909 Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage Critical 9.8
• CVE-2026-68079 Apache CXF: DefaultEncryptingCodeDataProvider allows unlimited authorization code replay Critical 9.8
• CVE-2026-50628 Apache CXF: OAuth2: Inverted IP Binding Check Defeats Security Control Critical 9.8
• CVE-2025-48913 Apache CXF: Untrusted JMS configuration can lead to RCE Critical 9.8

All Apache Cxf vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-xf62-wr5p-5p95.