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CVE-2026-78471

MEDIUM 5.4 CVSS 3.1
Published
October 2, 2026
Last modified
October 3, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Description

The Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Author Name in all versions up to, and including, 3.1.15.1 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. Exploitation requires an administrator to have enabled Autoptimize's 'Lazy-load images?' option, the w3-total-cache/w3-total-cache.php file to be present on disk with the plugin disabled, a class named Minify_HTML to be loaded into scope by another plugin, and the malicious comment to be approved by a moderator before the payload renders.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • optimizingmatters Autoptimize — Up to and including 3.1.15.1

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L1232
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L908
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.15.1/classes/autoptimizeImages.php#L960
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3713884/autoptimize/trunk/classes/autoptimizeImages.php
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?reponame=&new=3713884%40autoptimize%2Ftags%2F3.1.16&old=3657650%40autoptimize%2Ftags%2F3.1.15.1
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/b14f574d-1490-423e-9ef3-ce8f844cb8f0?source=cve
  • nvd.nist.gov Official NVD record