CVE-2026-16618 ImproveSEO <= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution
Unauthenticated attackers can upload malicious PHP files to achieve remote code execution on sites using the Improve SEO plugin.
- 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-2026-16618?
CVE-2026-16618 is a critical vulnerability in Unknown Improve SEO, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.
Weakness: CWE-434
Which versions are affected by CVE-2026-16618?
How do I fix CVE-2026-16618?
No fix has been published for CVE-2026-16618 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-16618 being exploited?
There is no known exploitation of CVE-2026-16618 in the wild and no public exploit code.
Sources
Also known as GHSA-62v2-7mcm-qpm4.