CVE-2026-2027: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ampenhancer AMP Enhancer – Compatibility Layer for Official AMP Plugin
The AMP Enhancer – Compatibility Layer for Official AMP Plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the AMP Custom CSS setting in all versions up to, and including, 1.0.49 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
AI Analysis
Technical Summary
The AMP Enhancer plugin for WordPress contains a stored XSS vulnerability due to improper neutralization of input in the AMP Custom CSS setting. Authenticated administrators can inject malicious scripts that execute on page load. This vulnerability affects multi-site setups and installations with unfiltered_html disabled. The CVSS 3.1 score is 4.4, reflecting a medium severity with network attack vector, high attack complexity, and required privileges. No patch or official fix has been provided according to available data.
Potential Impact
An attacker with Administrator-level access can inject persistent malicious scripts into pages via the AMP Custom CSS setting. These scripts execute in the context of users visiting the affected pages, potentially leading to session hijacking, defacement, or other client-side impacts. The vulnerability does not affect availability and requires high privileges and complex attack conditions. It is limited to multi-site or restricted unfiltered_html environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Administrator access to trusted users only and consider disabling the AMP Custom CSS setting if possible. Monitor for updates from the vendor regarding patches or official mitigations.
CVE-2026-2027: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ampenhancer AMP Enhancer – Compatibility Layer for Official AMP Plugin
Description
The AMP Enhancer – Compatibility Layer for Official AMP Plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the AMP Custom CSS setting in all versions up to, and including, 1.0.49 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The AMP Enhancer plugin for WordPress contains a stored XSS vulnerability due to improper neutralization of input in the AMP Custom CSS setting. Authenticated administrators can inject malicious scripts that execute on page load. This vulnerability affects multi-site setups and installations with unfiltered_html disabled. The CVSS 3.1 score is 4.4, reflecting a medium severity with network attack vector, high attack complexity, and required privileges. No patch or official fix has been provided according to available data.
Potential Impact
An attacker with Administrator-level access can inject persistent malicious scripts into pages via the AMP Custom CSS setting. These scripts execute in the context of users visiting the affected pages, potentially leading to session hijacking, defacement, or other client-side impacts. The vulnerability does not affect availability and requires high privileges and complex attack conditions. It is limited to multi-site or restricted unfiltered_html environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Administrator access to trusted users only and consider disabling the AMP Custom CSS setting if possible. Monitor for updates from the vendor regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-02-05T21:25:59.550Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 698ffec8c9e1ff5ad85c720b
Added to database: 2/14/2026, 4:49:12 AM
Last enriched: 4/9/2026, 10:03:02 PM
Last updated: 5/22/2026, 1:19:34 PM
Views: 121
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