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ShortPixel Image Optimizer vulnerabilities
ShortPixel Image Optimizer has 4 known vulnerabilities in this database. The most recent published record is dated 18 Sep 2026.
- Known vulnerabilities
- 4
- Active installs
- 300,000+
- Latest version
- 6.5.6
- Last updated
- 9 Sep 2026
- Most recent
- 18 Sep 2026
Find it in your WordPress dashboard under Plugins. Severity is based on the CVSS score published with the CVE where one is available.
| Vulnerability | Severity | Affected | Fix | Published |
|---|---|---|---|---|
| PHP object injection CVE-2026-17086 | High 8.8 | Up to 6.5.5 | Fixed in a later version (latest 6.5.6) | 18 Sep 2026 |
| Cross-site scripting (XSS) CVE-2026-4335 | Medium 5.4 | Up to 6.4.3 | Fixed in a later version (latest 6.5.6) | 26 Mar 2026 |
| Arbitrary file read CVE-2026-1246 | Medium 4.9 | Up to 6.4.2 | Fixed in a later version (latest 6.5.6) | 5 Feb 2026 |
| Broken access control CVE-2025-11378 | Medium 5.4 | Up to 6.3.4 | Fixed in a later version (latest 6.5.6) | 18 Oct 2025 |
Read the published descriptions
- CVE-2026-17086, 18 Sep 2026
- The ShortPixel Image Optimizer - Optimize Images, Convert WebP & AVIF plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 6.5.5 via deserialization of untrusted input . This makes it possible for authenticated attackers, with author-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present. CVE record
- CVE-2026-4335, 26 Mar 2026
- 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. CVE record
- CVE-2026-1246, 5 Feb 2026
- The ShortPixel Image Optimizer plugin for WordPress is vulnerable to Arbitrary File Read via path traversal in the 'loadFile' parameter in all versions up to, and including, 6.4.2 due to insufficient path validation and sanitization in the 'loadLogFile' AJAX action. This makes it possible for authenticated attackers, with Editor-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information such as database credentials and authentication keys. CVE record
- CVE-2025-11378, 18 Oct 2025
- The ShortPixel Image Optimizer - Optimize Images, Convert WebP & AVIF plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'shortpixel_ajaxRequest' AJAX action in all versions up to, and including, 6.3.4. This makes it possible for authenticated attackers, with Contributor-level access and above, to export and import site options. CVE record
What to do if you run ShortPixel Image Optimizer
If you run ShortPixel Image Optimizer, open WordPress and check the installed version in Plugins. Compare it with the affected versions in the vulnerability record. If a fixed version is available, take a current backup and update to that version or the latest supported release.
If no fixed version exists, consider disabling and removing the plugin or replacing it with a maintained alternative. After dealing with the affected software, check administrator users, unexpected file changes, redirects, unfamiliar pages and security logs for signs that the site may already have been altered.
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