Vulnerability · Published Aug 4, 2026 · Assigned by WPScan
CVE-2026-16618ImproveSEO <= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution
Critical 9.8
In plain English
A critical-severity unrestricted file upload in Improve SEO from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.8%top 42.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Improve SEO | 0 – through 2.0.11 |
Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-7169446638d1/ exploit, vdb-entry, technical-description