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CVE-2025-55035— Mattermost Desktop DoS when user has basic authentication server configured

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 5.13.0及之前版本存在安全漏洞，该漏洞源于模态窗口管理不当，可能导致攻击者通过恶意服务器配置强制弹出无法关闭的模态窗口，从而拒绝用户使用桌面应用程序。

CVSS 6.1 · Medium EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-55035

Vulnerability Information
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Vulnerability Title
Mattermost Desktop DoS when user has basic authentication server configured
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a server that uses basic authentication from accessing their server which allows an attacker that provides a malicious server to the user to deny use of the Desktop App via having the user configure the malicious server and forcing a modal popup that cannot be closed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
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 5.13.0及之前版本存在安全漏洞，该漏洞源于模态窗口管理不当，可能导致攻击者通过恶意服务器配置强制弹出无法关闭的模态窗口，从而拒绝用户使用桌面应用程序。
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 0 ~ 5.0.13 -

II. Public POCs for CVE-2025-55035

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III. Intelligence Information for CVE-2025-55035

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Same Patch Batch · Mattermost · 2025-10-16 · 7 CVEs total

CVE-2025-58073 8.1 HIGH Arbitrary Mattermost Team can be joined by manipulating the OAuth state
CVE-2025-58075 8.1 HIGH Arbitrary Mattermost Team can be joined by manipulating the SAML RelayState
CVE-2025-41410 5.4 MEDIUM Slack import bypasses email verification for team access controls
CVE-2025-41443 4.3 MEDIUM Guest user can discover active public channels
CVE-2025-10545 3.1 LOW Guest user can add unauthorized team users to private channels
CVE-2025-54499 3.1 LOW Insecure string comparison enables timing attacks

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-754

V. Comments for CVE-2025-55035

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