CVE-2026-3718 ManageWP Worker <= 4.9.31 - Unauthenticated Stored Cross-Site Scripting via 'MWP-Key-Name' Header
Unauthenticated attackers can inject scripts via headers, leading to admin session hijacking when visiting specific debug pages.
- 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-2026-3718?
CVE-2026-3718 is a high-severity cross-site scripting vulnerability in ManageWP Worker, published on 14 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The ManageWP Worker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'MWP-Key-Name' HTTP request header in all versions up to, and including, 4.9.31. This is due to insufficient input sanitization and output escaping of attacker-controlled header values. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever an administrator visits the plugin's connection management page with debug parameters.
Weakness: CWE-79
Which versions are affected by CVE-2026-3718?
How do I fix CVE-2026-3718?
No fix has been published for CVE-2026-3718 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-2026-3718 being exploited?
There is no known exploitation of CVE-2026-3718 in the wild and no public exploit code.
Sources
Also known as GHSA-vfvf-2h2w-cj9j.