CVE-2025-55035

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://mattermost.com/security-updates	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*

History

19 Oct 2026, 16:10

Type	Values Removed	Values Added
Summary		(es) Las versiones menor o igual que 5.13.0 de la aplicación de escritorio de Mattermost no logran gestionar modales en la aplicación de escritorio de Mattermost, lo que impide a un usuario con un servidor que utiliza autenticación básica acceder a su servidor, lo que permite a un atacante que proporciona un servidor malicioso al usuario denegar el uso de la aplicación de escritorio al hacer que el usuario configure el servidor malicioso y forzar una ventana emergente modal que no se puede cerrar.

Information

Published : 2025-10-16 16:15

Updated : 2026-10-19 16:10

NVD link : CVE-2025-55035

Mitre link : CVE-2025-55035

CVE.ORG link : CVE-2025-55035

JSON object : View

Products Affected

mattermost

mattermost_desktop

CWE

CWE-754

Improper Check for Unusual or Exceptional Conditions

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