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Description

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.

PUBLISHED Reserved 2026-04-29 | Published 2026-04-30 | Updated 2026-05-04 | Assigner VulnCheck




LOW: 2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 4.6CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unknown

7.4.0 (semver)
affected

Credits

hss94531 (https://github.com/hss94531) finder

Beatriz Fresno Naumova finder

References

github.com/siteserver/cms/issues/3892 exploit

github.com/siteserver/cms/issues/3892 issue-tracking

github.com/siteserver/cms product

www.vulncheck.com/...cross-site-scripting-via-stl-processing third-party-advisory

cve.org (CVE-2026-7429)

nvd.nist.gov (CVE-2026-7429)

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