CVE-2026-50629: Apache CXF: OAuth2: Log Injection via Unsanitized Client Identifier

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-10-26
Weakness: CWE-93

Description

The 'clientId' parameter from incoming HTTP requests is directly concatenated into OAuth2 server log warning messages without sanitizing control characters. This allows an attacker to inject arbitrary content, including fake log entries, into the server's log files. Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.

Affected products

Apache Software Foundation Apache CXF: before 4.1.7; from 4.2.0 before 4.2.2 — fixed in 4.1.7, 4.2.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache CXF 4.1.7, 4.2.2. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-50629 or the next vulnerability affects your stack