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CVE-2025-55073— MS Teams plugin OAuth allows editing arbitrary posts

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 10.11.3及之前的10.11.x版本、10.5.11及之前的10.5.x版本和10.12.0及之前的10.12.x版本存在安全漏洞，该漏洞源于未验证帖子更新与MSTeams插件OAuth流程的关系，可能导致攻击者通过特制URL编辑任意帖子。

CVSS 5.4 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-55073

Vulnerability Information
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Vulnerability Title
MS Teams plugin OAuth allows editing arbitrary posts
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
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 10.11.3及之前的10.11.x版本、10.5.11及之前的10.5.x版本和10.12.0及之前的10.12.x版本存在安全漏洞，该漏洞源于未验证帖子更新与MSTeams插件OAuth流程的关系，可能导致攻击者通过特制URL编辑任意帖子。
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 ~ 10.11.3 -

II. Public POCs for CVE-2025-55073

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III. Intelligence Information for CVE-2025-55073

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Same Patch Batch · Mattermost · 2025-11-14 · 5 CVEs total

CVE-2025-55070 6.5 MEDIUM Lack of MFA enforcement in WebSocket connections
CVE-2025-11794 4.9 MEDIUM Password hash and MFA secret returned in user email verification endpoint
CVE-2025-11776 4.3 MEDIUM Guest user can discover archived public channels
CVE-2025-41436 3.1 LOW Unauthorized access to archived channel content via threads interface

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-306

V. Comments for CVE-2025-55073

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