PT-2026-22584 · Mattermost · Mattermost Desktop App

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

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.

Exploit

Fix

DoS

Weakness Enumeration

CWE-829

Related Identifiers

CVE-2026-1628

Affected Products

Mattermost Desktop App

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1628.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-1628 · Security Note
• https://osv.dev/vulnerability/CVE-2026-1628 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://twitter.com/CVEnew/status/2028478022718804015 · Twitter Post
• https://twitter.com/infoflowcloud/status/2028478091811500226 · Twitter Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-1628 · Note