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CVE-2025-27936— Webhook Secret Exposure via Timing attack in MSteams plugin

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 Plugin MSTeams是美国Mattermost公司的一个Mattermost插件。 Mattermost Plugin MSTeams 2.1.0之前版本存在安全漏洞，该漏洞源于webhook密钥比较未使用恒定时间算法，可能导致密钥泄露。

CVSS 5.3 · Medium EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-27936

Vulnerability Information
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Vulnerability Title
Webhook Secret Exposure via Timing attack in MSteams plugin
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Plugin MSTeams 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Plugin MSTeams是美国Mattermost公司的一个Mattermost插件。 Mattermost Plugin MSTeams 2.1.0之前版本存在安全漏洞，该漏洞源于webhook密钥比较未使用恒定时间算法，可能导致密钥泄露。
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 10.5.0 ~ 10.5.1 -

II. Public POCs for CVE-2025-27936

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III. Intelligence Information for CVE-2025-27936

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Same Patch Batch · Mattermost · 2025-04-16 · 6 CVEs total

CVE-2025-27571 4.3 MEDIUM Channel metadata visible in archived channels despite configuration setting
CVE-2025-2564 4.3 MEDIUM Unauthorized View Access to Archived Channel Member Info
CVE-2025-24839 3.1 LOW Unauthorized AI bot activation via Wrangler plugin
CVE-2025-31363 3.0 LOW Data exfiltration via AI plugin Jira tool
CVE-2025-27538 2.2 LOW MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-208

V. Comments for CVE-2025-27936

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