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TI-2021-18886 Aliases CVE-2021-42654GHSA-mpcp-76x2-2jrq

SiteServer CMS < V5.1 is affected by an unrestricted upload of a file with dangerous type…

Priority MEDIUM 46CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-434.

Summary

SiteServer CMS < V5.1 is affected by an unrestricted upload of a file with dangerous type (getshell), which could be used to execute arbitrary code.

Why it matters now

EPSS 0.0181 78th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:sscms:siteserver_cms:*:*:*:*:*:*:*:*before 5.1VulnerableSscms
  • cpe:2.3:a:sscms:siteserver_cms:*:*:*:*:*:*:*:* Versions before 5.1 Vulnerable ·Sscms

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-42654
  2. 2026-10-03 Alias added: GHSA-mpcp-76x2-2jrq

References

Patch 1

Advisory 2

  • TI-2022-21766 SiteServer CMS 7.1.3 is vulnerable to SQL Injection. CVSS 3.1CRITICAL 9.8
  • TI-2022-21765 SiteServer CMS 7.1.3 has a SQL injection vulnerability the background. CVSS 3.1CRITICAL 9.8
  • TI-2025-28799 An arbitrary file read vulnerability in the ReadTextAsynchronous function of SSCMS v7.3.1… CVSS 3.1HIGH 7.1
  • TI-2022-10923 SiteServer CMS v7.x allows attackers to execute arbitrary code via a crafted plug-in. CVSS 3.1CRITICAL 9.8
  • TI-2021-18887 SiteServer CMS V6.15.51 is affected by a SQL injection vulnerability. CVSS 3.1HIGH 8.8
  • TI-2023-02682 SiteServer CMS search cross site scripting CVSS 3.1MEDIUM 6.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences