File Upload Vulnerability in Improve SEO Plugin for WordPress
CVE-2026-16618

Currently unrated

Key Information:

Vendor

WordPress
Status
Improve Seo
Vendor
CVE Published:
4 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-16618?

The Improve SEO WordPress plugin versions up to 2.0.11 has a critical issue where it fails to effectively validate uploaded files. The plugin only checks the content type of the file during the upload process. This insufficient validation allows untrusted users to upload files with malicious extensions into a publicly accessible directory. Consequently, if an attacker uploads an executable PHP file, they can achieve remote code execution on the server, which poses significant security risks.

Affected Version(s)

Improve SEO 0 <= 2.0.11

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-16618 - Proof of Concept

References

https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

João Ramos Maciel
WPScan
.