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CVE-2025-49222— Mattermost Shared Channel Upload Type Validation Bypass

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。

CVSS 6.8 · Medium EPSS 0.30% · P23
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
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

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III. Intelligence Information for CVE-2025-49222

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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

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-434

V. Comments for CVE-2025-49222

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