CVE-2025-55035

🔶 medium

Summary

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 Score

6.1

Medium

EPSS Score

0.1

Exploit Probability

Published Date

2025-10-16

First Seen: 2026-01-05

📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 38.9% of all 328,009 vulnerabilities in our database.

#200,536

Below average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Oct 16, 2025

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

Doyensec

SSVC data provided by CISA

Last Modified 2025-10-29

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H

CWE IDs (Weakness Types)

CWE-754

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
mattermost	mattermost_desktop	Affected	< 5.13.1.0

🔗 References 1

https://mattermost.com/security-updates

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-6517	🔶 medium	6.3	0.2	Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were...	2026-06-15
CVE-2026-8683	🔶 medium	6.5	0.2	Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Matterm...	2026-06-15
CVE-2026-3471	🔶 medium	6.5	0.0	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 t...	2026-05-18
CVE-2026-4643	ℹ️ low	3.5	0.0	Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying ...	2026-05-18
CVE-2026-1628	🔶 medium	4.6	0.0	Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Ma...	2026-03-02
CVE-2026-1046	⚠️ high	7.6	0.0	Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost ser...	2026-02-16

These CVEs affect the same products