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Vulnerability record · CVE-2026-3375 · published 27 May 2026

CVE-2026-3375: Cross-site scripting vulnerability

The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the /wp-json/litespeed/v1/notify_ccss and /wp-json/litespeed/v1/notify_ucss REST API endpoints in all versions up to, and including, 7.7. These endpoints accept CSS content from QUIC.cloud callback notifications and store it to disk without sanitization. The stored content is later rendered inline frontend page loads without output escaping. The access control protecting these endpoints is IP-based validation that can potentially be bypassed when the WordPress site is deployed behind a reverse proxy, load balancer, or CDN with certain configurations. This makes it possible for unauthenticated attackers, under certain conditions, to inject arbitrary JavaScript into CCSS/UCSS content.

7.2 CVSS 3.1 High EPSS 0.44% · top 64.4% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the /wp-json/litespeed/v1/notify_ccss and /wp-json/litespeed/v1/notify_ucss REST API endpoints in all versions up to, and including, 7.7. These endpoints accept CSS content from QUIC.cloud callback notifications and store it to disk without sanitization. The stored content is later rendered inline frontend page loads without output escaping. The access control protecting these endpoints is IP-based validation that can potentially be bypassed when the WordPress site is deployed behind a reverse proxy, load balancer, or CDN with certain configurations. This makes it possible for unauthenticated attackers, under certain conditions, to inject arbitrary JavaScript into CCSS/UCSS content.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

LinkTags
https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/cloud.cls.php#L2085
https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/css.cls.php#L401
https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/css.cls.php#L595
https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/optimize.cls.php#L477
https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/rest.cls.php#L108
https://plugins.trac.wordpress.org/browser/litespeed-cache/trunk/src/router.cls.php#L732
https://plugins.trac.wordpress.org/changeset/3473912/
https://www.wordfence.com/threat-intel/vulnerabilities/id/40fa29f5-525a-4986-91f9-0210a7594e46?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-3375), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.