---
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'
---

## Overview

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

- `SSCMS <= 7.4.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.