Vulnerability in Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization — CVE-2026-120739

What to do now

Update Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization to 4.2.19 or later.

Affected versions

• Everything up to and including 4.2.18

The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 's (missing_srcsets[*][*].s)' parameter in all versions up to, and including, 4.2.18 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The HMAC signature required to pass the REST endpoint's authorization check is published in plaintext to unauthenticated visitors inside the inline optimoleDataOptimizer JavaScript object on any page with an incomplete profile, making the effective authentication barrier nonexistent.

This description is reproduced verbatim from the public vulnerability record.

• https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.17/inc/manager.php#L519
• https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.17/inc/rest.php#L1020
• https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.17/inc/rest.php#L159
• https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.17/inc/tag_replacer.php#L312
• https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.17/inc/tag_replacer.php#L529
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3784828%40optimole-wp&new=3784828%40optimole-wp

This page is compiled automatically from public databases. Accuracy is not guaranteed; confirm against the vendor advisory before acting.