Is CVE-2026-74040 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74040 being exploited in the wild.

How severe is CVE-2026-74040?

Critical severity, with a CVSS score of 9.1, published 13 October 2026.

Which products and versions are affected?

Wazuh Manager 3.9.0 before 4.14.8.

Is there a fix for CVE-2026-74040?

Yes: fixed in 4.14.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-74040 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-74040?

Check whether you run Wazuh Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74040: Wazuh arbitrary file overwrite in cluster worker communication

CVE-2026-74040 · Severity: critical · CVSS 9.1 · Published 2026-10-13

Wazuh is a security monitoring platform used to protect corporate networks by monitoring endpoints and collecting security logs. A vulnerability in how the manager processes file updates from cluster workers allows an attacker controlling a compromised worker to overwrite critical configuration files on the manager, leading to complete remote code execution with root privileges across the manager and every connected agent.

Technologies: Wazuh Manager. Vendors: Wazuh.

Quick answers

Is CVE-2026-74040 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74040 being exploited in the wild.
How severe is CVE-2026-74040?: Critical severity, with a CVSS score of 9.1, published 13 October 2026.
Which products and versions are affected?: Wazuh Manager 3.9.0 before 4.14.8.
Is there a fix for CVE-2026-74040?: Yes: fixed in 4.14.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-74040 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-74040?: Check whether you run Wazuh Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 4.14.8

Technical details

The MasterHandler.process_files_from_worker function in the cluster communication layer contains two independent defects: a basename bypass of the excluded_files blocklist using trailing slashes (os.path.basename("etc/ossec.conf/") == ""), and missing direction validation allowing workers to send master-sourced files without authorization. An attacker with cluster key access can inject malicious XML into ossec.conf or agent.conf to achieve root RCE via the wodle command execution mechanism.

Affected products

Wazuh Manager 3.9.0 before 4.14.8

Timeline

2026-10-13: disclosed
2026-09-25: patched

References

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