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9.4

Wazuh manager can be taken over via worker file overwrite

CVE-2026-74040 · published 2 days ago
Summary

Wazuh manager versions from 3.9.0 up to 4.14.7 allow a cluster worker to replace important configuration files on the master server. If an attacker controls a worker, they can change these files and run code with full system privileges on the manager and all connected agents. Update to the latest Wazuh manager version or apply the vendor's patch to stop this behavior.

What to do
  • Update wazuh wazuh-manager to version 4.14.8 or later.
Affected software
VendorProductAffected versions
wazuh wazuh-manager < 4.14.8
Original advisory text
Wazuh 3.9.0 before 4.14.8 Arbitrary File Overwrite RCE via process_files_from_worker
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
9.4 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-862Missing Authorization
Timeline
Published13 Oct 2026
Updated15 Oct 2026
First seen13 Oct 2026
Sources
CVE-2026-74040 · NVD
CVE-2026-74040 · MITRE
CVE-2026-74040 · OSV
GHSA-88p6-7cm8-xwj8 · GHSA
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