Summaryinfo

A vulnerability labeled as problematic has been found in ShortPixel Image Optimizer Plugin up to 6.4.3 on WordPress. The affected element is the function getEditorPopup of the file media-popup.php of the component REST API. Executing a manipulation can lead to cross site scripting. The identification of this vulnerability is CVE-2026-4335. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in ShortPixel Image Optimizer Plugin up to 6.4.3 on WordPress and classified as problematic. This vulnerability affects the function getEditorPopup of the file media-popup.php of the component REST API. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. CVE summarizes:

The ShortPixel Image Optimizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the attachment post_title in all versions up to, and including, 6.4.3. This is due to insufficient output escaping in the getEditorPopup() function and its corresponding media-popup.php template. Specifically, the attachment's post_title is retrieved from the database via get_post() in AjaxController.php (line 435) and passed directly to the view template (line 449), where it is rendered into an HTML input element's value attribute without esc_attr() escaping (media-popup.php line 139). Since WordPress allows Authors to set arbitrary attachment titles (including double-quote characters) via the REST API, a malicious author can craft an attachment title that breaks out of the HTML attribute and injects arbitrary JavaScript event handlers. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts that execute whenever a higher-privileged user (such as an administrator) opens the ShortPixel AI editor popup (Background Removal or Image Upscale) for the poisoned attachment.

The weakness was shared by daroo. The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-4335 since 03/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

By approaching the search of inurl:media-popup.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 6.4.3 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• ShortPixel

Name

• Image Optimizer Plugin

Version

• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3

CPE 2.3info

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CPE 2.2info

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