CyberRota Analysis
This is a medium severity vulnerability with a CVSS score of 5.4. It may be remotely exploitable.
CVE
CVE-2026-4274
Severity
MEDIUM
CVSS
5.4
EPSS
0.14%
Original NVD Description
Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to restrict team-level access when processing membership sync from a remote cluster, which allows a malicious remote cluster to grant a user access to an entire private team instead of only the shared channel via sending crafted membership sync messages that trigger team membership assignment. Mattermost Advisory ID: MMSA-2026-00574
Related CVEs
Other vulnerabilities affecting the same vendor(s)