PT-2026-32091 · Optimole · Optimole – Optimize Images In Real Time
Quốc Huy
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Published
2026-04-11
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Updated
2026-04-11
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CVE-2026-5217
CVSS v3.1
7.2
High
| AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 4.2.2. This is due to insufficient input sanitization and output escaping on the user-supplied 's' parameter (srcset descriptor) in the unauthenticated /wp-json/optimole/v1/optimizations REST endpoint. The endpoint validates requests using an HMAC signature and timestamp, but these values are exposed directly in the frontend HTML making them accessible to any visitor. The plugin uses sanitize text field() on the descriptor value of rest.php, which strips HTML tags but does not escape double quotes. The poisoned descriptor is then stored via transients (backed by the WordPress options table) and later retrieved and injected verbatim into the srcset attribute of tag replacer.php without proper escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts into pages that will execute whenever a user accesses the injected page.
Fix
XSS
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Weakness Enumeration
Related Identifiers
Affected Products
Optimole – Optimize Images In Real Time