All vulnerabilities
CVE-2026-87920

W3 Total Cache <= 2.10.6 - Unauthenticated Stored Cross-Site Scripting via Comment Content

boldgrid W3 Total Cache
Open in ThreatlineRecord JSON
CVSS
7.2High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Published2 Oct 2026Updated 3 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version.

Description

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.

Text from CVE List

Affected versions 1

  • W3 Total Cacheaffected: all versions through 2.10.6CVE List

References 6