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Vulnerability record · CVE-2026-13354 · published 19 September 2026

CVE-2026-13354: Cross-site scripting vulnerability

The Asset CleanUp: Page Speed Booster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 1.4.0.5 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 is only exploitable on instances where combine_loaded_css has been enabled.

7.2 CVSS 3.1 High EPSS 0.24% · top 86.3% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
21 Sep 2026Last modified by NVD

Description

The Asset CleanUp: Page Speed Booster plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 1.4.0.5 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 is only exploitable on instances where combine_loaded_css has been enabled.

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/wp-asset-clean-up/tags/1.4.0.3/classes/OptimiseAssets/OptimizeCss.php#L579
https://plugins.trac.wordpress.org/browser/wp-asset-clean-up/tags/1.4.0.3/classes/OptimiseAssets/OptimizeJs.php#L824
https://plugins.trac.wordpress.org/browser/wp-asset-clean-up/tags/1.4.0.4/classes/OptimiseAssets/OptimizeCss.php#L579
https://plugins.trac.wordpress.org/browser/wp-asset-clean-up/tags/1.4.0.4/classes/OptimiseAssets/OptimizeJs.php#L824
https://plugins.trac.wordpress.org/changeset?reponame=&old=3699024%40wp-asset-clean-up&new=3699024%40wp-asset-clean-up
https://research.cleantalk.org/cve-2026-13354
https://www.wordfence.com/threat-intel/vulnerabilities/id/4cc8ec2b-f203-4c7c-8720-043f8634a447?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-13354), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.