CVE-2024-39777— Malicious remote can invite itself to an arbitrary local channel
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I. Basic Information for CVE-2024-39777
Vulnerability Information
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Vulnerability Title
Malicious remote can invite itself to an arbitrary local channel
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/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 存在安全漏洞，该漏洞源于共享频道启用时未能禁止未经请求的邀请公开对本地频道的访问权限，这允许恶意远程人员发送带有现有本地频道 ID 的邀请，然后该本地频道将在未经本地管理员同意的情况下共享。
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 | 9.9.0 | - |
II. Public POCs for CVE-2024-39777
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2024-08-01 · 10 CVEs total
| CVE-2024-39274 | 8.7 HIGH | Malicious remote can add users to arbitrary teams and channels |
| CVE-2024-36492 | 7.4 HIGH | Existing local user overwritten by malicious remote |
| CVE-2024-39832 | 6.8 MEDIUM | Permanently local data deletion by malicious remote |
| CVE-2024-41144 | 5.5 MEDIUM | Malicious remote can create/update/delete arbitrary posts in arbitrary channels |
| CVE-2024-39839 | 4.3 MEDIUM | Remote username set to an arbitrary string by remote user |
| CVE-2024-41162 | 4.1 MEDIUM | Malicious remote can make an arbitrary local channel read-only |
| CVE-2024-39837 | 3.8 LOW | Malicious remote can create arbitrary channels |
| CVE-2024-29977 | 2.7 LOW | Malicious remote can create arbitrary reactions on arbitrary posts |
| CVE-2024-41926 | 2.7 LOW | Malicious remote can claim that a user was synced from another remote |
IV. Related Vulnerabilities
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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 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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phpvms: /importer authorization bypass causing full database - CVE-2026-42205
Avo: Broken Access Control: Unauthorized Execution of Arbitr - CVE-2026-41487
Langfuse: Improper role-based-access control in Langfuse LLM - CVE-2026-42278
UltraDAG: Smart Account Spending Policy Bypass via Pockets
V. Comments for CVE-2024-39777
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