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TI-2026-06532 Aliases CVE-2026-7429GHSA-h9g3-q89c-mhwg

SSCMS v7.4.0 Reflected Cross-Site Scripting via STL Processing

Priority MEDIUM 44CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Cross-site scripting
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-79.

Summary

SSCMS v7.4.0 contains a reflected cross-site scripting vulnerability in the STL processing endpoint that allows attackers to execute arbitrary JavaScript by crafting malicious STL template payloads that are decrypted and returned without proper sanitization. Attackers can exploit improper output encoding in the /api/stl/actions/dynamic endpoint to inject executable JavaScript into JSON responses, leading to session hijacking, phishing attacks, and unauthorized actions performed on behalf of users.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00203 10th 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

VendorProductAffected versionsFixed inStatusSource
SiteServerSSCMS7.4.0—No fix listedCNA
  • SSCMS VendorSiteServer Affected 7.4.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-7429
  2. 2026-10-03 Alias added: GHSA-h9g3-q89c-mhwg

References

Other 2

  • 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-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