CVE-2026-111658 SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API
Site-scoped administrators can bypass isolation to read and modify other sites' channel data in SSCMS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-111658?
CVE-2026-111658 is a medium-severity missing authorization vulnerability in SiteServer SSCMS, published on 16 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
SiteServer SSCMS through 7.4.0 contains an authorization bypass vulnerability in ChannelsController that allows site-scoped administrators to access other sites' channels by supplying foreign channel IDs. Attackers with Channels permission on one site can read and overwrite another site's channel names, file paths, templates, link URLs, and custom fields, breaking multi-site isolation.
Weakness: CWE-639
Which versions are affected by CVE-2026-111658?
How do I fix CVE-2026-111658?
No fix has been published for CVE-2026-111658 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-111658 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111658 exists.
Sources
Also known as GHSA-f64v-vg62-99f4.