CVE-2026-44256: Wazuh: CRLF Log Injection via Unsanitized Basic-Auth Username

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-08-19 · updated 2026-10-26
Weakness: CWE-117

Description

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.4.0 until 4.14.6 and 5.0.0-beta2, api/api/middlewares.py decodes the Basic authentication username before credential validation and passes it to the access logger without neutralizing control characters. api/api/alogging.py interpolates that value into the plain-text API log. An unauthenticated attacker can include carriage returns or line feeds in the username to forge entries, obscure activity, or poison systems that consume the plain-text audit log. The JSON log format is not affected because JSON serialization escapes these characters. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.

Affected products

wazuh: from 4.4.0 before 4.14.6; 5.0.0-beta1 — fixed in 4.14.6

How to fix

Upgrade to a fixed version: wazuh 4.14.6. Check the vendor advisory for mitigations.

References

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