CVE-2026-7429

MEDIUM 4.6

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

CVSS Score

4.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	siteserver
Product	sscms
Published	Apr 30, 2026
Last Updated	Apr 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

siteserver / SSCMS

7.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siteserver/cms/issues/3892 github.com: https://github.com/siteserver/cms vulncheck.com: https://www.vulncheck.com/advisories/sscms-reflected-cross-site-scripting-via-stl-processing

Credits

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