CVE-2026-3433

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

Score
CVSS 3.1 4.3 Medium
Status
Analyzed - responsibledisclosure@mattermost.com
Published
2026-06-12
Last modified
2026-06-12
Weaknesses
CWE-200

Affected products

References

 
 
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