{"id":"CVE-2026-111658","title":"SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API","summary":"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 permissi…","severity":"low","cvss":3.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-639"],"vendor":"SiteServer","product":"SSCMS","affected":["SSCMS <= 7.4.0"],"published":"2026-10-16","updated":"2026-10-16","sourceUpdated":"2026-10-16T17:39:23.461Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111658","references":[{"url":"https://hackmd.io/@hieuPenguinnn/sscms-cross-site-channel-idor"},{"url":"https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Update.cs#L14-L31"},{"url":"https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Get.cs#L16-L41"},{"url":"https://www.vulncheck.com/advisories/siteserver-sscms-through-7.4.0-cross-site-authorization-bypass-via-channels-api","label":"VulnCheck Advisory: SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API"}],"tags":["cve.org"],"ingestedAt":"2026-10-16T18:43:08.673Z","slug":"CVE-2026-111658","body":"## Overview\n\nSiteServer 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.\n\n## Affected\n\n- `SSCMS <= 7.4.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":21,"depthScoreParts":{"impact":20.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}