CVE-2026-18109

HighCVSS 7.2

Published: 14/08/2026(UTC)Updated: 14/08/2026(UTC)Translated: 14/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.27%

18th percentile - higher than 18% of all known CVEs

Summary

The W3 Total Cache plugin for WordPress up to version 2.10.3 is vulnerable to Stored Cross-Site Scripting via Comment Author Name due to insufficient input sanitization and output escaping. The vulnerability is only exploitable when the Lazy Load Images feature is enabled, as the unsafe re-emission occurs exclusively within the LazyLoad mutator's img tag rewriting step.

Risk Assessment

An unauthenticated attacker can inject arbitrary web scripts into pages that will execute whenever a user accesses an injected page, potentially leading to session theft, account takeover, or malware distribution.

Recommendation

Update the W3 Total Cache plugin to the latest patched version. If updating is not possible, consider disabling the Lazy Load Images feature until the patch is applied.

Original NVD description (English source)

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.