What is CVE-2025-55035?

CVE-2025-55035 is a medium-severity vulnerability in Mattermost, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.1/10. Published 2025-10-16.

How severe is CVE-2025-55035?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Mattermost

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 serv…

EPSS: 0.003 (21.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H.

Affected products

Mattermost — versions 0, 5.13.1.0
Mattermost Mattermost_desktop

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-55035?: CVE-2025-55035 is a medium-severity vulnerability in Mattermost, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.1/10. Published 2025-10-16.
How severe is CVE-2025-55035?: Medium severity. CVSS v3 base score is 6.1 out of 10.