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CVE-2025-13352— Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking

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，该漏洞源于在反应转发中未验证插件机器人身份，可能导致通过特制通知帖子劫持GitHub反应功能。

CVSS 3.0 · Low EPSS 0.18% · P7
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I. Basic Information for CVE-2025-13352

Vulnerability Information
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Vulnerability Title
Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1287
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，该漏洞源于在反应转发中未验证插件机器人身份，可能导致通过特制通知帖子劫持GitHub反应功能。
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 10.11.0 ~ 10.11.6 -

II. Public POCs for CVE-2025-13352

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III. Intelligence Information for CVE-2025-13352

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Same Patch Batch · Mattermost · 2025-12-17 · 7 CVEs total

CVE-2025-12689 6.5 MEDIUM DoS in Calls plugin via malformed UTF-8 in WebSocket request
CVE-2025-62190 4.3 MEDIUM CSRF Allows Call Initiation and Message Delivery
CVE-2025-13326 3.9 LOW Mattermost Desktop App fails to enable Hardened Runtime when packaged for Mac App Store
CVE-2025-13324 3.7 LOW Lack of Invalidation of Legacy Remote Cluster Invite Tokens After Confirmation
CVE-2025-13321 3.3 LOW Mattermost Desktop App logging sensitive information and fails to clear data on server del
CVE-2025-62690 3.1 LOW Open redirect in error page when link opened in new tab

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-1287

V. Comments for CVE-2025-13352

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