CVE-2026-18109highobserved exploitationCWE-79

CVE-2026-18109: high-severity vulnerability in boldgrid W3 Total Cache

W3 Total Cache <= 2.10.3 - Unauthenticated Stored Cross-Site Scripting via Comment Author Name

Published

Follow this CVE+ Monitor W3 Total Cache

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

43Vexday Risk Score

Prioritize patching. It exploitation observed by VulnCheck.

ssvc Actcvss 7.2epss 0.4%
from disclosure to weapon
Published on NVDAug 14
VulnCheckAug 14
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected products
boldgrid · W3 Total Cache
Related CVEs — boldgrid W3 Total Cache

In the same product, most dangerous first.

CVE-2026-5032HIGHW3 Total Cache <= 2.9.3 - Unauthenticated Security Token Exposure via User-Agent HeaderEPSS 3.2%CVE-2026-9282HIGHW3 Total Cache <= 2.9.4 - Unauthenticated Arbitrary File Read via 'f_array[]' ParameterEPSS 2.9%CVE-2024-12008MEDIUMW3 Total Cache <= 2.8.1 Information Exposure via Log FilesEPSS 2.4%CVE-2024-12365HIGHW3 Total Cache <= 2.8.1 - Authenticated (Subscriber+) Missing Authorization to Server-Side Request ForgeryEPSS 1.8%CVE-2023-5359LOWW3 Total Cache <= 2.7.5 - Sensitive Credentials Stored in PlaintextEPSS 0.8%CVE-2024-12006MEDIUMW3 Total Cache <= 2.8.1 Missing Authorization to Unauthenticated Plugin Deactivation and Extensions Activation/DeactivationEPSS 0.5%