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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-5217 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.1/inc/rest.php#L1008 Wordfence
https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.1/inc/rest.php#L159 Wordfence
https://plugins.trac.wordpress.org/browser/optimole-wp/tags/4.2.1/inc/tag_replacer.php#L526 Wordfence
https://plugins.trac.wordpress.org/browser/optimole-wp/trunk/inc/rest.php#L1008 Wordfence
https://plugins.trac.wordpress.org/browser/optimole-wp/trunk/inc/rest.php#L159 Wordfence
https://plugins.trac.wordpress.org/browser/optimole-wp/trunk/inc/tag_replacer.php#L526 Wordfence
https://www.wordfence.com/threat-intel/vulnerabilities/id/50417068-339a-4ae5-9c90-8f08f54ce0af?source=cve Wordfence

Weakness Enumeration

CWE-ID CWE Name Source
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Wordfence  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-5217
NVD Published Date:
04/10/2026
NVD Last Modified:
04/10/2026
Source:
Wordfence