XSS in Shortpixel Image Optimizer – Optimize Images, Convert Webp & Avif
CVE-2026-4335
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()…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (15.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/a156234f-2644-4d17-aaa5-4f088…
- plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/trunk/class/view/…
- plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.4.3/class/…
- plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/trunk/class/Contr…
- plugins.trac.wordpress.org/browser/shortpixel-image-optimiser/tags/6.4.3/class/…
- plugins.trac.wordpress.org/changeset
Frequently asked questions
- What is CVE-2026-4335?
- CVE-2026-4335 is a medium-severity vulnerability in Shortpixel Image Optimizer – Optimize Images, Convert Webp & Avif, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-26.
- How severe is CVE-2026-4335?
- Medium severity. CVSS v3 base score is 5.4 out of 10.