Medium 4.6Published Apr 30, 2026

CVE-2026-7429SSCMS v7.4.0 Reflected Cross-Site Scripting via STL Processing

Updated under an hour ago (Oct 26, 2026, 4:00 AM ET)

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It affects siteserver SSCMS. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 4.6 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

siteserver SSCMS siteserver:sscms (from the name)	7.4.0	CNA record

References

https://github.com/siteserver/cms/issues/3892issue-tracking
https://github.com/siteserver/cmsproduct
https://www.vulncheck.com/advisories/sscms-reflected-cross-site-scripting-via-stl-processingthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.