Reflected Cross-Site Scripting Vulnerability in SSCMS by SiteServer
CVE-2026-7429

2.1LOW

Key Information:

Vendor

Siteserver

Status
Sscms
Vendor
CVE Published:
30 April 2026

What is CVE-2026-7429?

The SSCMS product version 7.4.0 has a reflected cross-site scripting vulnerability that affects the STL processing endpoint. This security flaw allows attackers to execute arbitrary JavaScript by sending specially crafted malicious STL template payloads. Due to improper output encoding in the /api/stl/actions/dynamic endpoint, these payloads can be decrypted and returned without sufficient sanitization. Attackers exploit this weakness to inject executable JavaScript into JSON responses, which could lead to serious security issues, including session hijacking, phishing attacks, and unauthorized actions carried out on behalf of users.

Affected Version(s)

SSCMS 7.4.0

References

https://github.com/siteserver/cms/issues/3892
issue-tracking
https://github.com/siteserver/cms
product
https://www.vulncheck.com/advisories/sscms-reflected-cros...
third-party-advisory

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

hss94531 (https://github.com/hss94531)
Beatriz Fresno Naumova
.