optimizingmatters Autoptimize Plugin up to 3.1.14 on WordPress add_lazyload cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in optimizingmatters Autoptimize Plugin up to 3.1.14 on WordPress. Affected is the function add_lazyload. Performing a manipulation results in cross site scripting. This vulnerability was named CVE-2026-2430. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in optimizingmatters Autoptimize Plugin up to 3.1.14 on WordPress. This affects the function add_lazyload. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

The weakness was presented by Matthew Rollings. It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-2430 since 02/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 3.1.14 eliminates this vulnerability. Applying the patch a0f87112fe80b5a97b036229c41cb18454392858 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• WordPress Plugin

Vendor

• optimizingmatters

Name

• Autoptimize Plugin

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.1.14

License

• open-source

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CPE 2.2info

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