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CVE-2025-20051— Arbitrary file read via block duplication in Mattermost Boards

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，该漏洞源于修补和复制Boards时无法正确验证输入。

CVSS 9.9 · Critical EPSS 0.60% · P46

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2025-20051

Vulnerability Information
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Vulnerability Title
Arbitrary file read via block duplication in Mattermost Boards
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
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，该漏洞源于修补和复制Boards时无法正确验证输入。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 10.4.0 ~ 10.4.1 -

II. Public POCs for CVE-2025-20051

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III. Intelligence Information for CVE-2025-20051

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Same Patch Batch · Mattermost · 2025-02-24 · 5 CVEs total

CVE-2025-25279 9.9 CRITICAL Arbitrary file read in Mattermost Boards via import & export board archive
CVE-2025-24490 9.6 CRITICAL SQL Injection in Mattermost Boards via board category ID reordering
CVE-2025-24526 4.3 MEDIUM Channel export permitted on archived channel when viewing archived channels is disabled
CVE-2025-1412 3.1 LOW Session Persistence After User-to-Bot Conversion

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-22

V. Comments for CVE-2025-20051

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