CVE-2023-3581

8.1 highEPSS 0.3%

High (8.1) in mattermost mattermost server. EPSS 0.3% chance of exploitation in the next 30 days.

Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs.

Severity

8.1 high

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-31)
CWE: CWE-346
Published: 2023-07-17
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19