CVE-2026-19760 json
WP Fastest Cache <= 1.5.0 - Unauthenticated Stored Cross-Site Scripting via HTTP Host Header
published 2026-08-26 2 mo ago modified 2026-08-26 2 mo ago also EUVD-2026-66249
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | 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
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/69a22238-88e8-4ff5-8e2b-8c58a04ff154?source=cve
- plugins.trac.wordpress.org /browser/wp-fastest-cache/tags/1.5.0/inc/js-utilities.php#L274
- plugins.trac.wordpress.org /browser/wp-fastest-cache/tags/1.5.0/inc/js-utilities.php#L257
- plugins.trac.wordpress.org /browser/wp-fastest-cache/tags/1.5.0/wpFastestCache.php#L507
- plugins.trac.wordpress.org /browser/wp-fastest-cache/tags/1.4.9/inc/js-utilities.php#L274
- plugins.trac.wordpress.org /browser/wp-fastest-cache/tags/1.4.9/inc/js-utilities.php#L257
- plugins.trac.wordpress.org /browser/wp-fastest-cache/tags/1.4.9/wpFastestCache.php#L507
Sources
- CVE List CVE-2026-19760
- NVD CVE-2026-19760
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.