PT-2026-26711 · Optimizingmatters · Autoptimize

Hung Nguyen · Published 2026-03-20 · Updated 2026-03-21 · CVE-2026-2352

Mitre

CVSS v3.1

6.4

Medium

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

The Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ao post preload' meta value in all versions up to, and including, 3.1.14. This is due to insufficient input sanitization in the ao metabox save() function and missing output escaping when the value is rendered into a <link> tag in autoptimizeImages.php. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, granted the "Image optimization" or "Lazy-load images" setting is enabled in the plugin configuration.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-2352

Affected Products

Autoptimize

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-2352 · Security Note
• https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.14/classes/autoptimizeMetabox.php#L276 · Note
• https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.14/classes/autoptimizeImages.php#L804 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/5f3f9891-710e-49e4-b388-aa6d99c01840?source=cve · Note
• https://github.com/futtta/autoptimize/commit/60d1e487e536a97ae317784f8aeaf0d2e93cd717 · Note
• https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.14/classes/autoptimizeImages.php#L938 · Note
• https://plugins.trac.wordpress.org/browser/autoptimize/trunk/classes/autoptimizeMetabox.php#L276 · Note
• https://plugins.trac.wordpress.org/browser/autoptimize/trunk/classes/autoptimizeImages.php#L804 · Note
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3482530%40autoptimize&new=3482530%40autoptimize&sfp_email=&sfph_mail= · Note