CVE-2025-55035
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-16

Last updated on: 2025-10-29

Assigner: Mattermost, Inc.

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.
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Meta Information
Published
2025-10-16
Last Modified
2025-10-29
Generated
2026-06-16
AI Q&A
2025-10-16
EPSS Evaluated
2026-06-15
NVD
CVE-2025-55035
EUVD
EUVD-2025-34773
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost_desktop to 5.13.1.0 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-754 The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
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Executive Summary

Mattermost Desktop App versions up to 5.13.0 have a flaw in handling modal dialogs when connecting to servers using basic authentication. An attacker can set up a malicious server that, when configured by the user, triggers a modal popup in the app that cannot be closed, effectively blocking the user from accessing their server through the Desktop App.

Impact Analysis

This vulnerability can cause a denial of service for users of the Mattermost Desktop App by preventing them from accessing their servers if they connect to a malicious server that triggers an unclosable modal popup. This disrupts normal use of the app and can impact productivity.

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