Auth bypass in Wazuh Wazuh-Manager
CVE-2026-74040
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.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-88p6-7cm8-xwj8 (vendor-advisory)
- github.com/wazuh/wazuh/releases/tag/v4.14.8 (release-notes, patch)
- www.vulncheck.com/advisories/wazuh-3.9.0-before-4.14.8-arbitrary-file-overwrite… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74040?
- CVE-2026-74040 is a critical-severity vulnerability in Wazuh Wazuh-Manager, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-10-13.
- How severe is CVE-2026-74040?
- Critical severity. CVSS v3 base score is 9.1 out of 10.