CVE-2026-111658CWE-639

CVE-2026-111658

Low · published October 16, 2026

CVSS v3.1
3.8
EPSS
0%
Percentile
17.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.8 · LOW
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00265 · 17.5th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-10-16T22:17Z
References (5)
https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Get.cs#L16-L41 · [email protected]https://github.com/siteserver/cms/blob/sscms-v7.2.1/src/SSCMS.Web/Controllers/Admin/Cms/Channels/ChannelsController.Update.cs#L14-L31 · [email protected]https://hackmd.io/@hieuPenguinnn/sscms-cross-site-channel-idor · [email protected]https://www.vulncheck.com/advisories/siteserver-sscms-through-7.4.0-cross-site-authorization-bypass-via-channels-api · [email protected]https://hackmd.io/@hieuPenguinnn/sscms-cross-site-channel-idor · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 18 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 16 OCT 17:39Z
    SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API
    cvelistv5
  • 16 OCT 17:39Z
    SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API
    cvelistv5