CVE-2026-18051criticalCWE-22

CVE-2026-18051: critical vulnerability in W3 Total Cache

W3 Total Cache < 2.10.5 - Unauthenticated Arbitrary Directory File Write and .htaccess Overwrite via Path Traversal in the Page Cache Key

Published

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63Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendcvss 10epss 2.0%
The W3 Total Cache WordPress plugin before 2.10.5 does not properly validate the request path it uses to build cache file names, allowing unauthenticated attackers to write a file into any existing directory on the server, inside or outside the web root, overwriting whatever occupies the target name. On Apache, the same flaw overwrites the site's .htaccess files, which breaks the site and can strip hardening rules that other security measures rely on.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
Affected products
Unknown · W3 Total Cache
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — W3 Total Cache

In the same product, most dangerous first.

CVE-2025-9501CRITICALW3 Total Cache < 2.8.13 - Unauthenticated Command InjectionEPSS 22.1%CVE-2026-107321MEDIUMW3 Total Cache < 2.10.6 - Author+ Path Traversal via CDN Media Library ImportEPSS 0.2%