Stored Cross-Site Scripting Vulnerability in SiteSEO Plugin for WordPress
CVE-2025-9277

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Siteseo – Seo Simplified
Vendor
CVE Published:
26 August 2025

What is CVE-2025-9277?

The SiteSEO – SEO Simplified plugin for WordPress suffers from a Stored Cross-Site Scripting vulnerability due to a flawed preg_replace expression. This issue arises from inadequate sanitization of user inputs and fails to properly escape outputs. As a result, authenticated users with Contributor-level access can exploit this vulnerability to inject malicious scripts into web pages, leading to execution of those scripts when other users access the compromised pages.

Affected Version(s)

SiteSEO – SEO Simplified * <= 1.2.7

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/siteseo/tags/1...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Matthew Rollings
.
CVE-2025-9277 : Stored Cross-Site Scripting Vulnerability in SiteSEO Plugin for WordPress