TI-2026-75444 Aliases CVE-2026-111658 GHSA-f64v-vg62-99f4

SiteServer SSCMS authorization bypass exposes other sites' channels

MEDIUM 56CWE-639Published 2026-10-16 · Updated 2026-10-23

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

SiteServer SSCMS through 7.4.0 contains an authorization bypass in ChannelsController (CWE-639). Site-scoped administrators can supply channel IDs that belong to other sites, so an attacker with Channels permission on one site can read and overwrite another site's channel names, file paths, templates, link URLs and custom fields, breaking multi-site isolation.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

SiteServer SSCMS through 7.4.0 contains an authorization bypass vulnerability in ChannelsController that allows site-scoped administrators to access other sites' channels by supplying foreign channel IDs. Attackers with Channels permission on one site can read and overwrite another site's channel names, file paths, templates, link URLs, and custom fields, breaking multi-site isolation.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00325 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: Poc
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	up to 7.4.0	—	No fix listed	CNA

SSCMS VendorSiteServer Affected up to 7.4.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for SiteServer SSCMS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-16 Threatist record created from CVE-2026-111658
2026-10-16 Alias added: GHSA-f64v-vg62-99f4
2026-10-23 CISA SSVC decision points changed
2026-10-23 Priority changed: LOW → MEDIUM

References

Advisory 1

https://hackmd.io/@hieuPenguinnn/sscms-cross-site-channel-idor

Other 2

TI-2026-06536 SSCMS v7.4.0 SQL Injection via stl:sqlContent queryString CVSS 4.0HIGH 8.6
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
TI-2026-56879 SiteServer SSCMS Agent Installation Workflow access control CVSS 4.0LOW 2.3

Sources

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