Is CVE-2026-74040 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74040?

CVE-2026-74040 has a CVSS v3 severity of CRITICAL (9.1).

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CVE-2026-74040

Description

Wazuh versions from 3.9.0 before 4.14.8 contain an arbitrary file overwrite vulnerability in MasterHandler.process_files_from_worker allowing a cluster worker to overwrite protected master files. Attackers controlling a worker can use a trailing-slash basename bypass and missing extra_valid enforcement to overwrite ossec.conf and agent.conf, achieving root remote code execution across the manager and every agent.