CVE-2026-16618 — CRITICAL (9.8)

Vulnerability 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.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-434

References

https://wpscan.com/vulnerability/3754d4c0-1b67-49a4-a29a-7169446638d1/

FAQ

What is CVE-2026-16618?

CVE-2026-16618 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 public...

How severe is CVE-2026-16618?

CVE-2026-16618 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-16618?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.