TI-2026-56879 Aliases CVE-2026-82486 GHSA-v975-p34v-4fvr

SiteServer SSCMS Agent Installation Workflow access control

LOW 12CWE-266Published 2026-08-30 · Updated 2026-08-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: High
Attack requirements: None
Impact type: Privilege escalation, Security bypass
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-266 and CWE-284.

Summary

A vulnerability was found in SiteServer SSCMS 7.4.0. Affected by this issue is some unknown functionality of the component Agent Installation Workflow. Performing a manipulation of the argument SecurityKey results in improper access controls. Remote exploitation of the attack is possible. The attack is considered to have high complexity. The exploitation is known to be difficult. The project was informed of the problem early through an issue report but has not responded yet.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00328 26th 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: No
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
SiteServer	SSCMS	7.4.0	—	No fix listed	CNA

SSCMS VendorSiteServer Affected 7.4.0 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:sscms:sscms::::::::	—	—	Sscms

cpe:2.3:a:sscms:sscms:*:*:*:*:*:*:*:* Versions — — ·Sscms

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-82486
2026-10-03 Alias added: GHSA-v975-p34v-4fvr

References

Other 1

https://github.com/siteserver/cms/issues/3898

TI-2026-06536 SSCMS v7.4.0 SQL Injection via stl:sqlContent queryString CVSS 4.0HIGH 8.6
TI-2026-75444 SiteServer SSCMS authorization bypass exposes other sites' channels CVSS 4.0MEDIUM 5.1
TI-2026-06532 SSCMS v7.4.0 Reflected Cross-Site Scripting via STL Processing CVSS 4.0LOW 2.1
TI-2019-08517 A issue was discovered in SiteServer CMS 6.9.0. CVSS 3.0HIGH 7.2
TI-2023-02682 SiteServer CMS search cross site scripting CVSS 3.1MEDIUM 6.1

Sources

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