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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 products

2
  • Mattermost/Mattermostinferred2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: <=11.6.1, <=11.5.4, <=10.11.16

Patches

Vulnerability mechanics

References

1

News mentions

1