CVE-2026-111658
CVE-2026-111658 · SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.1 · Medium · EPSS 0.3%
- Published
- Updated
Affected products and versions
sscms
- Versions
- ≥ 0, ≤ 7.4.0: Affected (custom)
No fix published
Original sources
- https://hackmd.io/@hieuPenguinnn/sscms-cross-site-channel-idor
- https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Update.cs#L14-L31
- https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Get.cs#L16-L41
- https://www.vulncheck.com/advisories/siteserver-sscms-through-7.4.0-cross-site-authorization-bypass-via-channels-api
- https://nvd.nist.gov/vuln/detail/CVE-2026-111658