BoldGrid W3 Total Cache Plugin up to 2.10.6 on WordPress Output-Buffer Regex Rewrite mutate_url cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in BoldGrid W3 Total Cache Plugin up to 2.10.6. This impacts the function mutate_url of the component Output-Buffer Regex Rewrite. Executing a manipulation can lead to cross site scripting. This vulnerability is handled as CVE-2026-87920. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in BoldGrid W3 Total Cache Plugin up to 2.10.6. It has been declared as problematic. This vulnerability affects the function mutate_url of the component Output-Buffer Regex Rewrite. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

The W3 Total Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via Output-Buffer Regex Rewrite in all versions up to, and including, 2.10.6 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 'Remove query strings from static resources' option is enabled in W3 Total Cache, as mutate_url() must strip the '?' delimiter and everything following it — including the closing quote of the outer attribute — to break the attribute boundary.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-87920 since 09/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• BoldGrid

Name

• W3 Total Cache Plugin

Version

• 2.10.0
• 2.10.1
• 2.10.2
• 2.10.3
• 2.10.4
• 2.10.5
• 2.10.6

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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