PT-2026-22584 · Mattermost · Mattermost Desktop App

Published 2026-03-02 · Updated 2026-03-02 · CVE-2026-1628

Positive Technologies (AI Summary)

CVSS v3.1

4.6

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Mattermost versions prior to 5.13.3

Description The Mattermost Desktop App versions up to 5.13.3 do not properly restrict navigation to external sites within the application. This allows a malicious server to potentially expose preload script functionality to untrusted servers when a user opens an external link from within their Mattermost server. The issue involves a failure to attach listeners that restrict navigation.

Recommendations Update Mattermost Desktop App to a version greater than 5.13.3.

Fix

Weakness Enumeration

CWE-829

Related Identifiers

CVE-2026-1628

Affected Products

Mattermost Desktop App

References · 5

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-1628 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-1628 · Security Note
• https://twitter.com/infoflowcloud/status/2028478091811500226 · Twitter Post
• https://twitter.com/CVEnew/status/2028478022718804015 · Twitter Post