CVE-2026-77365
Received Received - Intake

Stored XSS in Optimole WordPress Plugin via above_fold_images Parameter

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: Wordfence

Description
The Optimole – Optimize Images | Convert WebP & AVIF | CDN & Lazy Load | Image Optimization plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'a' (above_fold_images) parameter in all versions up to, and including, 4.2.10 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.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-28
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-77365
EUVD
EUVD-2026-67398

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
optimole optimole to 4.2.10 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Optimole WordPress plugin. It allows unauthenticated attackers to inject malicious scripts into web pages via the 'a' parameter due to insufficient input sanitization and output escaping. The scripts execute when users access the compromised pages.

Detection Guidance

This vulnerability can be detected by checking for the presence of the Optimole plugin version 4.2.10 or lower on your WordPress site. Inspect the plugin files for the 'above_fold_images' parameter in the code. Look for unusual script injections in web pages served by the plugin.

Impact Analysis

If you use the affected Optimole plugin, attackers could steal user sessions, redirect to malicious sites, or deface your website. Users visiting your site may have their data compromised or be exposed to further attacks through the injected scripts.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for protecting user data. Organizations may face fines or legal consequences if user data is compromised due to inadequate security measures.

Mitigation Strategies

Immediately update the Optimole plugin to the latest version if available. If no update is available, consider disabling or removing the plugin until a patch is released. Monitor your site for any suspicious activity or unauthorized script injections.

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