CVE-2026-18109

The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 2.10.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the Lazy Load Images feature of W3 Total Cache is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.

Published 14 Aug 2026, 03:16 UTC Last modified 14 Aug 2026, 03:16 UTC

7.2

CVSS 3.1 HIGH base score CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack profile

The conditions required to exploit this vulnerability and its potential impact.

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Scope Changed

Confidentiality Low

Integrity Low

Availability None

Exploitability3.9

Impact2.7

Affected products

Product applicability statements supplied with the NVD record.

NVD has not published structured affected-product data for this record.

Weakness classification

CWE categories help security teams group the underlying software weakness.

CWECWE-79

Source references

External advisories, patches and technical reports attached to this CVE record.

NVD National Vulnerability Database recordnvd.nist.gov 01 Technical reference security@wordfence.com 02 Technical reference security@wordfence.com 03 Technical reference security@wordfence.com 04 Technical reference security@wordfence.com 05 Technical reference security@wordfence.com 06 Technical reference security@wordfence.com 07 Technical reference security@wordfence.com 08 Technical reference security@wordfence.com