CVE-2026-7429: Siteserver Sscms

Medium severity, CVSS 4.6. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Siteserver Sscms: version 7.4.0 only

Published 2026-04-30. Last modified 2026-06-17.