CVE-2025-27571— Channel metadata visible in archived channels despite configuration setting
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 10.5.1及之前版本、10.4.3及之前版本和9.11.9及之前版本存在安全漏洞，该漏洞源于归档频道元数据检查不充分，可能导致信息泄露。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-27571
Vulnerability Information
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Vulnerability Title
Channel metadata visible in archived channels despite configuration setting
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.
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 10.5.1及之前版本、10.4.3及之前版本和9.11.9及之前版本存在安全漏洞，该漏洞源于归档频道元数据检查不充分，可能导致信息泄露。
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 | 10.5.0 ~ 10.5.1 | - |
|
II. Public POCs for CVE-2025-27571
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-04-16 · 6 CVEs total
| CVE-2025-27936 | 5.3 MEDIUM | Webhook Secret Exposure via Timing attack in MSteams plugin |
| CVE-2025-2564 | 4.3 MEDIUM | Unauthorized View Access to Archived Channel Member Info |
| CVE-2025-24839 | 3.1 LOW | Unauthorized AI bot activation via Wrangler plugin |
| CVE-2025-31363 | 3.0 LOW | Data exfiltration via AI plugin Jira tool |
| CVE-2025-27538 | 2.2 LOW | MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users |
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Same vendor: Mattermost
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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
Same weakness: CWE-863
V. Comments for CVE-2025-27571
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