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CVE-2026-111658— SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API

Quick assessment

Affected
SiteServer SSCMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiteServer SSCMS 7.4.0 及更早版本在 ChannelsController 中存在授权绕过漏洞。该漏洞允许站点级管理员通过提供其他站点的频道 ID，访问非其所属站点的频道。拥有“频道”权限的攻击者可在一个站点上读取并覆盖其他站点的频道名称、文件路径、模板、链接 URL 以及自定义字段，从而破坏多站点隔离机制。

CVSS 3.8 · Low EPSS 0.33% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
SiteServer SSCMS ≤ 7.4.0 affected
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I. Basic Information for CVE-2026-111658

Vulnerability Information
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Vulnerability Title
SiteServer SSCMS through 7.4.0 Cross-Site Authorization Bypass via Channels API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SiteServer SSCMS 0 ~ 7.4.0 -

II. Public POCs for CVE-2026-111658

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-111658

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Vendor Advisories for CVE-2026-111658 (1)

Security Blog Posts for CVE-2026-111658 (1)

Other References for CVE-2026-111658 (1)

IV. Related Vulnerabilities

Same product: SSCMS
Same vendor: SiteServer
Same weakness: CWE-639