WordPress SiteGround Security plugin <= 1.5.8 - Broken Access Control vulnerability
Priority LOW 30CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SiteGround | SiteGround Security | up to 1.5.8 | — | No fix listed | CNA |
- SiteGround Security VendorSiteGround Affected up to 1.5.8 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66121
- 2026-10-03 Alias added: GHSA-j9wm-m2fc-3vmp
More SiteGround vulnerabilities
- TI-2022-00891 SiteGround Security <= 1.2.5 - Authentication Bypass via 2FA Setup CVSS 3.1CRITICAL 9.8
- TI-2022-00892 SiteGround Security <= 1.2.5 - Authorization Weakness to Authentication Bypass CVSS 3.1CRITICAL 9.8
- TI-2023-00224 SiteGround Security < 1.3.1 - Admin+ SQLi CVSS 3.1HIGH 8.8
- TI-2019-15271 SiteGround Optimizer <= 5.0.12 - Missing Authorization CVSS 3.1CRITICAL 9.8
- TI-2026-56695 WordPress SiteGround Security plugin <= 1.6.6 - 2FA Bypass vulnerability CVSS 3.1HIGH 8.1
- TI-2026-41353 WordPress SiteGround Email Marketing plugin <= 1.7.5 - Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
Sources
- CVE-2025-66121 · CVE Program
- CVE-2025-66121 · NVD
- FIRST EPSS
- GHSA-j9wm-m2fc-3vmp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences