CVE-2026-39521 WordPress Nelio Content plugin <= 4.3.1 - Server Side Request Forgery (SSRF) vulnerability
An attacker can exploit a Server-Side Request Forgery vulnerability in the Nelio Content plugin to make arbitrary requests from the server.
- 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-2026-39521?
CVE-2026-39521 is a medium-severity server-side request forgery vulnerability in Nelio Content, published on 8 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Server-Side Request Forgery (SSRF) vulnerability in Nelio Software Nelio Content nelio-content allows Server Side Request Forgery.This issue affects Nelio Content: from n/a through <= 4.3.1.
Weakness: CWE-918
Which versions are affected by CVE-2026-39521?
How do I fix CVE-2026-39521?
No fix has been published for CVE-2026-39521 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-39521 being exploited?
There is no known exploitation of CVE-2026-39521 in the wild and no public exploit code.
Sources
Also known as GHSA-7vhv-799g-fcfv.