EUVD-2026-13842CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
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.
Analysis
The Autoptimize WordPress plugin contains a Stored Cross-Site Scripting (XSS) vulnerability in the lazy-loading image processing function that allows authenticated attackers with Contributor-level access to inject arbitrary web scripts into pages. The flaw exists in all versions up to and including 3.1.14 and stems from an overly permissive regular expression that fails to properly validate image tag attributes, enabling attackers to craft malicious image tags that break HTML structure and promote attribute values into executable code. …
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Remediation
Within 30 days: Identify affected systems running for WordPress is vulnerable to Stored Cross-Site Scripting v and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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