CVE-2026-19760highCWE-79

CVE-2026-19760: high-severity vulnerability in emrevona WP Fastest Cache – WordPress Cache…

WP Fastest Cache <= 1.5.0 - Unauthenticated Stored Cross-Site Scripting via HTTP Host Header

Published

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.2epss 0.4%
exploitation probability
0.4%top 67% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected products
emrevona · WP Fastest Cache – WordPress Cache Plugin
Related CVEs — emrevona WP Fastest Cache – WordPress Cache…

In the same product, most dangerous first.

CVE-2020-36836HIGHWP Fastest Cache <= 0.9.0.2 - Authenticated (Subscriber+) Arbitrary File DeletionEPSS 1.5%CVE-2024-4347HIGHWP Fastest Cache <= 1.2.6 - Authenticated (Administrator+) Arbitrary File DeletionEPSS 0.9%CVE-2023-1375MEDIUMWP Fastest Cache <= 1.1.2 - Missing Authorization to Cache DeletionEPSS 0.5%CVE-2023-1928MEDIUMWP Fastest Cache <= 1.1.2 - Missing Authorization in 'wpfc_preload_single_callback'EPSS 0.4%CVE-2023-1929MEDIUMWP Fastest Cache <= 1.1.2 - Missing Authorization in 'wpfc_purgecache_varnish_callback'EPSS 0.4%CVE-2023-1930MEDIUMWP Fastest Cache <= 1.1.2 - Missing Authorization in 'wpfc_clear_cache_of_allsites_callback'EPSS 0.4%
References
https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.4.9/inc/js-utilities.php#L257https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.4.9/inc/js-utilities.php#L274https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.4.9/wpFastestCache.php#L507https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.0/inc/js-utilities.php#L257https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.0/inc/js-utilities.php#L274https://plugins.trac.wordpress.org/browser/wp-fastest-cache/tags/1.5.0/wpFastestCache.php#L507https://www.wordfence.com/threat-intel/vulnerabilities/id/69a22238-88e8-4ff5-8e2b-8c58a04ff154?source=cve