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Vulnerability record · CVE-2023-4372 · published 11 January 2024

CVE-2023-4372: Litespeedtech litespeed cache cross-site scripting vulnerability

Litespeedtech · Litespeed Cache

The LiteSpeed Cache plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'esi' shortcode in versions up to, and including, 5.6 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

5.4 CVSS 3.1 Medium EPSS 17% · top 3.1% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected 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 'esi' shortcode in versions up to, and including, 5.6 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/litespeedtech/lscache_wp/commit/95a407d9f192b37ac6cf96d2aa50f240e3e6b2d7#diff-7b2c514b58d1b8a71655607 Patch
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/5.5.1/src/esi.cls.php#L480 Issue Tracking
https://plugins.trac.wordpress.org/changeset/2977143/litespeed-cache#file348 Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/27026f0f-c85e-4409-9973-4b9cb8a90da5?source=cve Third Party Advisory
https://github.com/litespeedtech/lscache_wp/commit/95a407d9f192b37ac6cf96d2aa50f240e3e6b2d7#diff-7b2c514b58d1b8a71655607 Patch
https://plugins.trac.wordpress.org/browser/litespeed-cache/tags/5.5.1/src/esi.cls.php#L480 Issue Tracking
https://plugins.trac.wordpress.org/changeset/2977143/litespeed-cache#file348 Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/27026f0f-c85e-4409-9973-4b9cb8a90da5?source=cve Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-4372), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.