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CVE-2026-50630 Apache Software Foundation CVE debrief

A CRLF injection vulnerability exists in the OAuth2 AuthorizationUtils class of Apache CXF. 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.

Vendor
Apache Software Foundation
Product
Apache CXF
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-12
Advisory published
2026-06-12
Advisory updated
2026-06-12

Who should care

Users of Apache CXF versions prior to 4.2.2 or 4.1.7 should upgrade to a fixed version to prevent potential CRLF injection attacks.

Technical summary

The vulnerability exists in the OAuth2 AuthorizationUtils class of Apache CXF. The 'realm' parameter in the WWW-Authenticate response header is not sanitized for CR and LF characters, allowing for potential injection of arbitrary HTTP headers or splitting of the HTTP response.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to Apache CXF version 4.2.2 or 4.1.7 to fix the CRLF injection vulnerability.

Evidence notes

The vulnerability has a CVSS score of 6.5 and is classified as MEDIUM severity.

Official resources

CVE-2026-50630 was published on 2026-06-12T10:16:22.950Z and modified on 2026-06-12T19:04:00.513Z.