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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| SiteServer | SSCMS | ≤ 7.4.0 | — |
References
- https://hackmd.io/@hieuPenguinnn/sscms-cross-site-channel-idor third-party-advisory
- https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Update.cs#L14-L31 technical-description
- https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Get.cs#L16-L41 technical-description
- VulnCheck Advisory: SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API third-party-advisory