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CVE-2026-78438

W3 Total Cache <= 2.10.5 - Unauthenticated Stored Cross-Site Scripting via LazyLoad Background Mutator

The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via LazyLoad Background Mutator in all versions up to, and including, 2.10.5 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 requires the "Lazy Load Images" feature with "Process background images" to be enabled, and the malicious comment to be approved by a moderator before execution is triggered.

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Boldgrid Wordpress
Products
W3 Total Cache Wordpress
CVE-2026-18109

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

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 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Boldgrid Wordpress
Products
W3 Total Cache Wordpress
CVE-2026-9282

W3 Total Cache <= 2.9.4 - Unauthenticated Arbitrary File Read via 'f_array[]' Parameter

The W3 Total Cache plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 2.9.4 via the setupSources function. This makes it possible for unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. Exploitation requires enabling manual minify mode and supplying a manual-format minify filename so that the hash is empty and the f_array[] entries are not overwritten before reaching setupSources().

CVSS 3.1 · 7.5 High EPSS 2.9% KEV · Not listed
Vendors
Boldgrid Wordpress
Products
W3 Total Cache Wordpress
CVE-2026-27384

WordPress W3 Total Cache plugin <= 2.9.1 - Arbitrary Code Execution vulnerability

Improper Validation of Specified Quantity in Input vulnerability in BoldGrid W3 Total Cache w3-total-cache allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects W3 Total Cache: from n/a through <= 2.9.1.

CVSS 3.1 · 9 Critical EPSS < 1% KEV · Not listed
Vendors
Boldgrid Wordpress
Products
W3 Total Cache Wordpress
CVE-2025-9501

W3 Total Cache < 2.8.13 - Unauthenticated Command Injection

The W3 Total Cache WordPress plugin before 2.8.13 is vulnerable to command injection via the _parse_dynamic_mfunc function, allowing unauthenticated users to execute PHP commands by submitting a comment with a malicious payload to a post.

CVSS 3.1 · 9 Critical EPSS 22.1% KEV · Not listed
Vendors
Wordpress
Products
W3 Total Cache Wordpress
CVE-2026-5032

W3 Total Cache <= 2.9.3 - Unauthenticated Security Token Exposure via User-Agent Header

The W3 Total Cache plugin for WordPress is vulnerable to information exposure in all versions up to, and including, 2.9.3. This is due to the plugin bypassing its entire output buffering and processing pipeline when the request's User-Agent header contains "W3 Total Cache", which causes raw mfunc/mclude dynamic fragment HTML comments — including the W3TC_DYNAMIC_SECURITY security token — to be rendered in the page source. This makes it possible for unauthenticated attackers to discover the value of the W3TC_DYNAMIC_SECURITY constant by sending a crafted User-Agent header to any page that contains developer-placed dynamic fragment tags, granted the site has the fragment caching feature enabled. With the leaked W3TC_DYNAMIC_SECURITY token, an attacker can craft valid mfunc tags to execute arbitrary PHP code on the server, achieving remote code execution.

CVSS 3.1 · 7.5 High EPSS 3.2% KEV · Not listed
Vendors
Boldgrid Wordpress
Products
W3 Total Cache Wordpress