VULNERABILITY INTELLIGENCE

CVE-2026-3433

CVSS score4.3 MEDIUM
EPSS probability0.18%
CISA KEVNot currently listed
Published2026-06-12
Last modified2026-06-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-200

Primary references