CVE-2025-11776— Guest user can discover archived public channels
Quick assessment
Affected
Mattermost Mattermost
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.
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11之前版本存在安全漏洞，该漏洞源于未能正确限制对归档频道搜索API的访问，可能导致访客用户发现归档公共频道。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-11776
Vulnerability Information
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Vulnerability Title
Guest user can discover archived public channels
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11之前版本存在安全漏洞，该漏洞源于未能正确限制对归档频道搜索API的访问，可能导致访客用户发现归档公共频道。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | <11 ~ <11 | - |
|
II. Public POCs for CVE-2025-11776
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-11-14 · 5 CVEs total
| CVE-2025-55070 | 6.5 MEDIUM | Lack of MFA enforcement in WebSocket connections |
| CVE-2025-55073 | 5.4 MEDIUM | MS Teams plugin OAuth allows editing arbitrary posts |
| CVE-2025-11794 | 4.9 MEDIUM | Password hash and MFA secret returned in user email verification endpoint |
| CVE-2025-41436 | 3.1 LOW | Unauthorized access to archived channel content via threads interface |
IV. Related Vulnerabilities
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Same vendor: Mattermost
-
CVE-2026-75587
Plaintext pre-auth secret exposure via Desktop App diagnosti -
CVE-2026-9693
Mattermost thread memberships persist after team removal, ex -
CVE-2026-9859
Mattermost Boards plugin didn’t enforce role-based authoriza -
CVE-2026-9816
Insufficient server-side validation of board member role fie -
CVE-2026-10080
Boards plugin panics on WebSocket command with non-string fi
V. Comments for CVE-2025-11776
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