CVE-2025-66121: WordPress SiteGround Security plugin <= 1.5.8 - Broken Access Control vulnerability
Published Dec 16, 2025
·Updated
Missing Authorization vulnerability in SiteGround SiteGround Security sg-security allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects SiteGround Security: from n/a through <= 1.5.8.
Affected Software
2 affected components
SiteGround SiteGround Security<=1.5.8
wordpress/siteground-security<=1.5.8
Event History
Dec 16, 2025
CVE Published
via MITRE·08:12 AM
Data Sourced
via MITRE·08:12 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·09:15 AM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What is the severity of CVE-2025-66121?
CVE-2025-66121 is classified as a missing authorization vulnerability with potentially high impact if exploited.
2
How do I fix CVE-2025-66121?
To fix CVE-2025-66121, update SiteGround Security to version 1.5.9 or later.
3
What software is affected by CVE-2025-66121?
CVE-2025-66121 affects SiteGround Security versions from n/a up to and including 1.5.8.
4
What type of vulnerability is CVE-2025-66121?
CVE-2025-66121 is a missing authorization vulnerability that allows exploitation of incorrectly configured access control security levels.
5
Can CVE-2025-66121 affect WordPress sites?
Yes, CVE-2025-66121 affects the WordPress plugin SiteGround Security versions 1.5.8 and below.