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Medium severity4.3NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-3433

CVE-2026-3433

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/mattermost/mattermost-serverGo
>= 11.6.0, < 11.6.111.6.1
github.com/mattermost/mattermost-serverGo
>= 11.5.0, < 11.5.511.5.5
github.com/mattermost/mattermost-serverGo
>= 10.11.0, < 10.11.1710.11.17
github.com/mattermost/mattermost/server/v8Go
>= 8.0.0-20250731163400-5b955468ea1e, < 8.0.0-20260504071740-9408b98025d78.0.0-20260504071740-9408b98025d7

Affected products

3

Patches

Vulnerability mechanics

References

15

News mentions

1