SiteGround Security <= 1.5.8 — Missing Authorization
CVE-2025-66121Published · Updated Action summary
Affected: ≤1.5.8Update to 1.5.9 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-862 Missing Authorization
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Security Optimizer – The All-In-One Protection Plugin sg-security
- Affected≤ 1.5.8
- Patched in1.5.9
Update to 1.5.9 or newer.
You are affected if you run ≤ 1.5.8. Version 1.5.9 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Security Optimizer – The All-In-One Protection Plugin.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.5.9, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Security Optimizer – The All-In-One Protection Plugin to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Legion Hunter.
The SiteGround Security plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on a function in versions up to, and including, 1.5.8. This makes it possible for unauthenticated attackers to perform an unauthorized action.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Security Optimizer – The All-In-One Protection Plugin
All 8| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Two-Factor Authentication via Brute Force ≤1.6.8Update to 1.6.9 | CVE-2026-118185 | |
| Medium5.3 | 2-Factor Authentication Bypass ≤1.6.6Update to 1.6.7 | CVE-2026-82228 | |
| Medium5.3 | IP Allowlist Bypass ≤1.6.4Update to 1.6.5 | CVE-2026-13342 | |
| Medium4.3 | Missing Authorization via hide_notice() ≤1.5.0Update to 1.5.1 | CVE-2024-38774 | |
| High7.2 | Authenticated (Administrator+) SQL Injection ≤1.3.0Update to 1.3.1 | CVE-2023-0234 |
- Medium4.3Two-Factor Authentication via Brute Force
≤1.6.8Update to 1.6.9
- Medium5.32-Factor Authentication Bypass
≤1.6.6Update to 1.6.7
- Medium5.3IP Allowlist Bypass
≤1.6.4Update to 1.6.5
- Medium4.3Missing Authorization via hide_notice()
≤1.5.0Update to 1.5.1
- High7.2Authenticated (Administrator+) SQL Injection
≤1.3.0Update to 1.3.1
Same weakness (Missing Authorization)
All Missing Authorization| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.