Is CVE-2026-4335 actively exploited?

No active exploitation of CVE-2026-4335 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4335 be exploited remotely?

Yes. CVE-2026-4335 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4335?

CVE-2026-4335 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-4335

CWE-79Published: March 26, 2026· Updated: Mar 30, 2026

5.4

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.7th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-4335 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.