CVE-2021-37864— Users can view the contents of an archived channel when access is explicitly denied by the system admin
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I. Basic Information for CVE-2021-37864
Vulnerability Information
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Vulnerability Title
Users can view the contents of an archived channel when access is explicitly denied by the system admin
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
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 6.1 及更早版本存在安全漏洞，该漏洞允许经过身份验证的用户查看存档频道的内容。
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 | unspecified ~ 6.2 | - |
II. Public POCs for CVE-2021-37864
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://mattermost.com/security-updates/x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-37864
Same Patch Batch · Mattermost · 2022-01-18 · 4 CVEs total
| CVE-2021-37866 | 4.7 MEDIUM | Session is not invalidated on server-side when user logged out of Boards |
| CVE-2021-37865 | 4.3 MEDIUM | Server-side Denial of Service while processing a specifically crafted GIF file |
| CVE-2021-37867 | 4.3 MEDIUM | Emails of all users are exposed via one of the Boards APIs |
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- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-284
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V. Comments for CVE-2021-37864
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