CVE-2026-7429 SSCMS v7.4.0 Reflected Cross-Site Scripting via STL Processing
Attackers can inject malicious JavaScript via STL templates in SSCMS, leading to session hijacking and unauthorized user actions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-7429?
CVE-2026-7429 is a low-severity cross-site scripting vulnerability in siteserver SSCMS, published on 30 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-7429?
How do I fix CVE-2026-7429?
No fix has been published for CVE-2026-7429 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-7429 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7429 exists.
Sources
Also known as GHSA-h9g3-q89c-mhwg.