CVE-2024-36257— Lack of permission check when updating the profile picture of a remote user (shared channels enabled)
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I. Basic Information for CVE-2024-36257
Vulnerability Information
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Vulnerability Title
Lack of permission check when updating the profile picture of a remote user (shared channels enabled)
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0, when using shared channels with multiple remote servers connected, fail to check that the remote server A requesting the server B to update the profile picture of a user is the remote that actually has the user as a local one . This allows a malicious remote A to change the profile images of users that belong to another remote server C that is connected to the server A.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/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 9.5.5及之前的9.5.x版本和9.8.0版本存在安全漏洞，该漏洞源于在连接多个远程服务器的共享通道时，缺少用户身份验证。
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 | 9.8.0 | - |
II. Public POCs for CVE-2024-36257
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2024-07-03 · 6 CVEs total
| CVE-2024-39830 | 8.1 HIGH | Timing attack during remote cluster token comparison when shared channels are enabled |
| CVE-2024-6428 | 5.3 MEDIUM | Limited DoS due to permitting creating users with user-defined IDs |
| CVE-2024-39807 | 3.1 LOW | Channel IDs of archived/restored channels leaked via webhook events |
| CVE-2024-39361 | 3.1 LOW | Creating posts with user-defined IDs permitted in CreatePost API |
| CVE-2024-39353 | 2.7 LOW | RemoteClusterFrame payloads are audit logged in full |
IV. Related Vulnerabilities
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Same vendor: Mattermost
- 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-2024-36257
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