CVE-2026-50630

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

State: Published
Severity: 6.5 Medium
Published: Jun 12, 2026
Updated: Aug 7, 2026
Reserved: Jun 5, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N	CISA-ADP

Weaknesses

CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Affected Products

Product	Versions
Apache CXFApache Software Foundation	4.2.0 to before 4.2.2Affected 4.0.0 to before 4.1.7Affected before 3.6.12Affected

References

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