CVE-2026-15273
Received Received - Intake

Stored XSS in Automatic.css WordPress Plugin

Publication date: 2026-09-26

Last updated on: 2026-09-26

Assigner: Wordfence

Description
The Automatic.css plugin for WordPress is vulnerable to Stored Cross-Site Scripting via REQUEST_URI in all version 4.0.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that will execute whenever an administrator accesses the Activity Log settings page.

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Meta Information

Published
2026-09-26
Last Modified
2026-09-26
Generated
2026-09-26
AI Q&A
2026-09-26
EPSS Evaluated
N/A
NVD
CVE-2026-15273
EUVD
EUVD-2026-87526

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
automatic_css automatic_css 4.0.0

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

The Automatic.css plugin for WordPress has a stored Cross-Site Scripting (XSS) vulnerability in version 4.0.0. This flaw allows unauthenticated attackers to inject malicious scripts via the REQUEST_URI parameter. The scripts execute when an administrator views the Activity Log settings page due to insufficient input sanitization and output escaping.

Impact Analysis

An attacker could exploit this to steal sensitive information like session cookies or login credentials. It may also allow unauthorized actions on behalf of the administrator. The impact includes potential data breaches, account takeovers, or further compromise of the WordPress site.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR and HIPAA requirements for data protection. Organizations may face fines or penalties for failing to secure user data adequately. Compliance programs could be compromised if sensitive data is exposed.

Mitigation Strategies

Update the Automatic.css plugin to the latest version immediately. Disable the plugin if no update is available. Monitor WordPress admin activity logs for suspicious scripts. Restrict access to the Activity Log settings page to trusted administrators only.

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