CVE-2026-39521 MEDIUM

CVE-2026-39521: WordPress Nelio Content plugin <= 4.3.1 - Server Side Request Forgery (SSRF) vulnerability

Vendor Nelio Software

Product Nelio Content

Weakness CWE-918 · SSRF

Published April 8, 2026

Last update April 29, 2026

View on NVD All CVEs

CVSS base score

4.9/10

Attack vector Network

Attack complexity High

Privileges required Low

User interaction None

Confidentiality Low

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Explanation of Vulnerability in Simple Terms

02Summary

Nelio Content versions up to 4.3.1 contain a server-side request forgery vulnerability that allows authenticated users to make the site send HTTP requests to internal or external systems on the attacker's behalf. The vulnerability requires low-level authentication and high attack complexity. An attacker can read sensitive data or modify resources accessible from the site's network position.

What an attacker can do

03Attacker Capabilities

Make the site send HTTP requests to internal systems or external URLs to read or modify data.

Potential impact on your site

04Site Impact

Authenticated attackers can access internal services, read sensitive files, or trigger actions on systems the site can reach.

Conditions required to exploit

05Prerequisites

Attacker must have a low-privilege user account on the site; no user interaction required.

Key dates

06Disclosure timeline

April 8, 2026 CVE published

April 29, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-39521 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/918.html AskarLabs — CWE-918 write-up Server-Side Request Forgery

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