CVE-2026-15273 Automatic.css 4.0.0 - Unauthenticated Stored Cross-Site Scripting via REQUEST_URI
Unauthenticated attackers can inject scripts via REQUEST_URI that execute when administrators view the Activity Log settings page.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15273?
CVE-2026-15273 is a medium-severity cross-site scripting vulnerability in Automatic.css, published on 26 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-15273?
How do I fix CVE-2026-15273?
No fix has been published for CVE-2026-15273 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-2026-15273 being exploited?
There is no known exploitation of CVE-2026-15273 in the wild and no public exploit code.
Sources
Also known as GHSA-xhhf-8p83-jrh4.