What is CVE-2026-39521?

CVE-2026-39521 is a medium-severity vulnerability in Nelio Software Content, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.9/10. Published 2026-04-08.

How severe is CVE-2026-39521?

Medium severity. CVSS v3 base score is 4.9 out of 10.

SSRF in Nelio Software Content

CVE-2026-39521

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (9.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Nelio Software Content — versions 0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

patchstack.com/database/Wordpress/Plugin/nelio-content/vulnerability/wordpress-… (vdb-entry)

Frequently asked questions

What is CVE-2026-39521?: CVE-2026-39521 is a medium-severity vulnerability in Nelio Software Content, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.9/10. Published 2026-04-08.
How severe is CVE-2026-39521?: Medium severity. CVSS v3 base score is 4.9 out of 10.