CVE-2026-19760CWE-79cross-site-scripting

CVE-2026-19760

High · published August 26, 2026

CVSS v3.1
7.2
EPSS
0%
Percentile
33.5
In the wild
Unconfirmed
What it is

The WP Fastest Cache – WordPress Cache Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via HTTP Host Header in all versions up to, and including, 1.5.0 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 Polylang or Polylang Pro plugin to be active and the Combine JS option to be enabled, as these conditions trigger the vulnerable Host-header-to-URL code path that writes attacker-controlled script src values into the shared page-cache file served to all subsequent visitors.

The record
Technical detail
CVSS v3.1
7.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00404 · 33.5th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-26T10:16Z
References (7)
https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.4.9/inc/js-utilities.php#L257 · [email protected]https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.4.9/inc/js-utilities.php#L274 · [email protected]https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.4.9/wpFastestCache.php#L507 · [email protected]https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.0/inc/js-utilities.php#L257 · [email protected]https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.0/inc/js-utilities.php#L274 · [email protected]https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.0/wpFastestCache.php#L507 · [email protected]https://www.wordfence.com/threat-intel/vulnerabilities/id/69a22238-88e8-4ff5-8e2b-8c58a04ff154?source=cve · [email protected]
EPSS history
Timeline
  • 27 AUG 06:20Z
    EPSS moved — → 0%
    epss
  • 26 AUG 05:30Z
    WP Fastest Cache <= 1.5.0 - Unauthenticated Stored Cross-Site Scripting via HTTP Host Header
    cvelistv5