CVE-2026-83591 AMP for WP <= 1.1.16 - Unauthenticated Stored Cross-Site Scripting via Comment Content Regex Transformation
Unauthenticated attackers can inject arbitrary web scripts via comment content due to insufficient sanitization in the AMP for WP plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83591?
CVE-2026-83591 is a high-severity cross-site scripting vulnerability in mohammed_kaludi AMP for WP – Accelerated Mobile Pages, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-83591?
How do I fix CVE-2026-83591?
No fix has been published for CVE-2026-83591 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-83591 being exploited?
There is no known exploitation of CVE-2026-83591 in the wild and no public exploit code.
Sources
Also known as GHSA-wprj-f7qx-9mm8.