Vulnerability · Published Mar 20, 2026 · Assigned by Wordfence
CVE-2026-2430Autoptimize <= 3.1.14 - Authenticated (Contributor+) Stored Cross-Site Scripting via Lazy-loaded Image Attributes
Medium 6.4
In plain English
A medium-severity cross-site scripting in Autoptimize from optimizingmatters. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).
Official description
The Autoptimize plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the lazy-loading image processing in all versions up to, and including, 3.1.14. This is due to the use of an overly permissive regular expression in the `add_lazyload` function that replaces all occurrences of `\ssrc=` in image tags without limiting to the actual attribute. 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 by crafting an image tag where the `src` URL contains a space followed by `src=`, causing the regex to break the HTML structure and promote text inside attribute values into executable HTML attributes.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| optimizingmatters | Autoptimize | 0 – through 3.1.14 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/ddc5c4d7-09dc-45bf-a3c7-5a0757e3110a?source=cve
- https://plugins.trac.wordpress.org/browser/autoptimize/trunk/classes/autoptimizeImages.php#L987
- https://plugins.trac.wordpress.org/browser/autoptimize/tags/3.1.14/classes/autoptimizeImages.php#L987
- https://github.com/futtta/autoptimize/commit/a0f87112fe80b5a97b036229c41cb18454392858
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3482530%40autoptimize&new=3482530%40autoptimize&sfp_email=&sfph_mail=