CVE-2025-49222— Mattermost Shared Channel Upload Type Validation Bypass
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I. Basic Information for CVE-2025-49222
Vulnerability Information
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Vulnerability Title
Mattermost Shared Channel Upload Type Validation Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
危险类型文件的不加限制上传
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，该漏洞源于未验证上传类型，可能导致上传非附件文件类型。以下版本受到影响：10.8.3及之前版本、10.5.8及之前版本、9.11.17及之前版本、10.9.2及之前版本和10.10.0及之前版本。
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 | 10.8.0 ~ 10.8.3 | - |
II. Public POCs for CVE-2025-49222
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
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Same Patch Batch · Mattermost · 2025-08-21 · 9 CVEs total
| CVE-2025-8023 | 6.8 MEDIUM | Path Traversal in Template Upload Allows Uploading Files Outside Target Directory |
| CVE-2025-36530 | 6.8 MEDIUM | Import Path Traversal Enables Unauthorized Unsigned Plugin Installation |
| CVE-2025-8402 | 4.9 MEDIUM | Nil pointer dereference in bulk import crashes server |
| CVE-2025-6465 | 4.3 MEDIUM | Path traversal in image upload with preview overwrite |
| CVE-2025-47870 | 4.3 MEDIUM | Team invite ID leaked to team admin with no member invite privileges |
| CVE-2025-53971 | 3.8 LOW | Channel and Team Membership APIs inadvertently allow loss of Member privileges. |
| CVE-2025-47700 | 3.5 LOW | AI plugin APIs can be triggered using post actions |
| CVE-2025-49810 | 3.5 LOW | Thread summarization allows persistent access to channel |
IV. Related Vulnerabilities
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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
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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-434
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CI4MS: Unrestricted PHP File Upload via Theme Installation L
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