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mattermost / mattermost_desktop CVEs

Beta · best-effort

30 CVEs tagged to mattermost / mattermost_desktop2 Critical, 3 High, 14 Medium, 11 Low, 0 Unrated.

CVE-2026-9602

Published Jul 17, 2026

Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash t…

CVSS 6.5 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-8075

Published Jul 17, 2026

Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another cha…

CVSS 6.5 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-8683

Published Jun 15, 2026

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to cr…

CVSS 6.5 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-6517

Published Jun 15, 2026

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermost Desktop App which allows an…

CVSS 6.3 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-4643

Published May 18, 2026

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows…

CVSS 3.5 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-3471

Published May 18, 2026

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in the Mattermost Desktop App which allows a malicious server o…

CVSS 6.5 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-1628

Published Mar 2, 2026

Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose prel…

CVSS 4.6 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-1046

Published Feb 16, 2026

Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via…

CVSS 7.6 · High
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2025-13326

Published Dec 17, 2025

Mattermost Desktop App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged for Mac App Store which allows an attacker to inherit TCC pe…

CVSS 3.9 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2025-13321

Published Dec 17, 2025

Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on server deletion which allows an attacker with access to the us…

CVSS 3.3 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2025-55035

Published Oct 16, 2025

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 se…

CVSS 6.1 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2025-58084

Published Oct 13, 2025

Mattermost Desktop App versions <= 5.13.0 fail to validate URLs external to the configured Mattermost servers, allowing an attacker on a server the user has configured to crash th…

CVSS 3.5 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2025-1398

Published Mar 17, 2025

Mattermost Desktop App versions <=5.10.0 explicitly declared unnecessary macOS entitlements which allows an attacker with remote access to bypass Transparency, Consent, and Contro…

CVSS 3.3 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2024-45835

Published Sep 16, 2024

Mattermost Desktop App versions <=5.8.0 fail to sufficiently configure Electron Fuses which allows an attacker to gather Chromium cookies or abuse other misconfigurations via remo…

CVSS 2.5 · Low
Vendor/product tagsBeta · best-effort

CVE-2024-39772

Published Sep 16, 2024

Mattermost Desktop App versions <=5.8.0 fail to safeguard screen capture functionality which allows an attacker to silently capture high-quality screenshots via JavaScript APIs.

CVSS 3.7 · Low
Vendor/product tagsBeta · best-effort

CVE-2024-39613

Published Sep 16, 2024

Mattermost Desktop App versions <=5.8.0 fail to specify an absolute path when searching the cmd.exe file, which allows a local attacker who is able to put an cmd.exe file in the…

CVSS 5.3 · Medium
Vendor/product tagsBeta · best-effort

CVE-2024-37182

Published Jun 14, 2024

Mattermost Desktop App versions <=5.7.0 fail to correctly prompt for permission when opening external URLs which allows a remote attacker to force a victim over the Internet to ru…

CVSS 4.7 · Medium
Vendor/product tagsBeta · best-effort

CVE-2023-5876

Published Nov 2, 2023

Mattermost fails to properly validate a RegExp built off the server URL path, allowing an attacker in control of an enrolled server to mount a Denial Of Service.

CVSS 3.1 · Low
Vendor/product tagsBeta · best-effort

CVE-2023-5875

Published Nov 2, 2023

Mattermost Desktop fails to correctly handle permissions or prompt the user for consent on certain sensitive ones allowing media exploitation from a malicious mattermost server

CVSS 3.7 · Low
Vendor/product tagsBeta · best-effort

CVE-2023-5339

Published Oct 17, 2023

Mattermost Desktop fails to set an appropriate log level during initial run after fresh installation resulting in logging all keystrokes including password entry being logged.

CVSS 4.7 · Medium
Vendor/product tagsBeta · best-effort

CVE-2018-21265

Published Jun 19, 2020

An issue was discovered in Mattermost Desktop App before 4.0.0. It mishandled the Same Origin Policy for setPermissionRequestHandler (e.g., video, audio, and notifications).

CVSS 5.3 · Medium
Vendor/product tagsBeta · best-effort
Showing 1-25 of 30 CVEsPage 1 of 2