CVE-2026-2430 is a stored cross-site scripting vulnerability in the Autoptimize WordPress plugin affecting all versions up to 3.1.14. The issue stems from a flawed regular expression in the add_lazyload function that replaces all instances of ' src=' in image tags without properly restricting to the actual attribute. An attacker with Contributor-level or higher privileges can craft an image tag with a src URL containing a space followed by 'src=', breaking the HTML structure and enabling injection of arbitrary executable scripts. This vulnerability allows persistent script injection that triggers whenever the compromised page is accessed.

An authenticated attacker with Contributor-level or higher privileges can inject malicious scripts into pages via crafted image tags. These scripts execute in the context of users viewing the page, potentially leading to session hijacking, defacement, or other client-side attacks. The vulnerability does not require user interaction beyond page access and affects the confidentiality and integrity of user sessions. The CVSS 3.1 score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and no user interaction required.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only to reduce risk. Monitor for plugin updates from optimizingmatters and apply them promptly once available. Avoid relying on this plugin version in environments where untrusted contributors can upload content.