CVE-2026-83591
Received Received - Intake

Stored XSS in AMP for WP Plugin via Comment Content

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: Wordfence

Description
The AMP for WP – Accelerated Mobile Pages plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content via Regex Transformation in all versions up to, and including, 1.1.16 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 crafted payload uses only WordPress-permitted comment tags and attributes (an anchor with href and title), and the AMP sanitizer pipeline omits javascript: protocol blocking, meaning neither the comment save filter nor the AMP output stage removes the malicious URI introduced by the transformation.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-83591
EUVD
EUVD-2026-86535

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpbeaverbuilder amp_for_wp to 1.1.16 (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 is a Stored Cross-Site Scripting (XSS) vulnerability in the AMP for WP plugin for WordPress. It allows unauthenticated attackers to inject malicious scripts into web pages via comment content due to insufficient input sanitization and output escaping. The injected scripts execute when users access the affected pages.

Detection Guidance

Detection involves checking for the AMP for WP plugin version up to 1.1.16 and inspecting WordPress comments for malicious scripts. Review plugin versions and scan comment content for suspicious anchor tags with href attributes using javascript: protocol.

Impact Analysis

Attackers could steal user sessions, deface websites, or redirect visitors to malicious sites. Users with access to the affected site may unknowingly execute harmful scripts, compromising their data or device security.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for protecting user data. Organizations may face legal penalties, reputational damage, and loss of trust due to non-compliance.

Mitigation Strategies

Immediately update the AMP for WP plugin to the latest version beyond 1.1.16. Remove any suspicious comments containing anchor tags with javascript: href attributes. Consider disabling comments temporarily if updates are delayed.

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