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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-3375 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID CWE Name Source
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Wordfence  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-3375
NVD Published Date:
05/27/2026
NVD Last Modified:
05/27/2026
Source:
Wordfence