CVE-2025-41436— Unauthorized access to archived channel content via threads interface
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 11.0之前版本存在安全漏洞，该漏洞源于未能正确执行允许用户查看归档频道的设置，可能导致普通用户通过关注线程中的在频道中打开功能访问归档频道内容和文件。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-41436
Vulnerability Information
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Vulnerability Title
Unauthorized access to archived channel content via threads interface
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions <11.0 fail to properly enforce the "Allow users to view archived channels" setting which allows regular users to access archived channel content and files via the "Open in Channel" functionality from followed threads
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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 11.0之前版本存在安全漏洞，该漏洞源于未能正确执行允许用户查看归档频道的设置，可能导致普通用户通过关注线程中的在频道中打开功能访问归档频道内容和文件。
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 | <11.0 ~ <11.0 | - |
|
II. Public POCs for CVE-2025-41436
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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-2025-11776 | 4.3 MEDIUM | Guest user can discover archived public channels |
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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-2025-41436
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