CVE-2018-21255

4.3 mediumEPSS 0.6%

Medium (4.3) in mattermost mattermost server. EPSS 0.6% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 5.1. Non-members of a channel could use the Channel PATCH API to modify that channel.

Severity

4.3 medium

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
CWE: CWE-732
Published: 2020-06-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19