CVE WatchSep 19, 2026

CVE-2026-76579

The LiteSpeed Cache plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'esi' parameter in all versions up to, and

CVSS

4.7

Medium

EPSS

0.2%

p14

KEV

—

Exploit Today

0-100

Published: Sep 19, 2026 · Last modified: Sep 19, 2026 · CWE-79

EPSS · 30d

Not enough EPSS history yet.

Technical description

The LiteSpeed Cache plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'esi' parameter in all versions up to, and including, 7.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires that the attacker supply a validly signed 'esi' value in the GET query string while submitting a separate attacker-controlled 'esi' payload as a POST body field, relying on PHP's default $_REQUEST merge order to have the POST value take precedence at the point of execution.

Official references

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