---
id: CVE-2026-15273
title: >-
  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
summary: >-
  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 …
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: Automatic.css
product: Automatic.css
affected:
  - Automatic.css 4.0.0
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T03:17:08.900'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15273'
references:
  - url: 'https://automaticcss.com/changelogs/'
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/Helpers/Logger.php#L187
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/Lib/WideEvents/Formatter/JsonFormatter.php#L25
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/Plugin.php#L175
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/automaticcss-plugin/trunk/classes/UI/Settings_Page/Activity_Log.php#L90
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/07d697c5-1c15-4d3a-8637-cc4fd408f209?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T03:25:24.699Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.