CVE-2026-75588

LOWCVSS 2.6

Description

Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717

Timeline

Published:September 17th, 2026 4:17 PM

Last modified:September 18th, 2026 1:46 PM

CVSS Scoring

CVSS v3: 2.6 (LOW)

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

Weaknesses (CWE)

CWE-1287

References & Reports

Advisories, patches, and third-party reports

https://mattermost.com/security-updates

Source: NIST NVD · Data may lag official sources by up to one minute