CVE-2026-3115

Guest users can view group member IDs without respecting view restrictions

CVSS 4.3 MEDIUMEPSS 0.2%CWE-863

Vexday Risk Score

13Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 4.3EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Ciclo de vida

26 mar 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to apply view restrictions when retrieving group member IDs, which allows authenticated guest users to enumerate user IDs outside their allowed visibility scope via the group retrieval endpoint.. Mattermost Advisory ID: MMSA-2026-00594

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

Productos afectados

Mattermost · Mattermost

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Referencias

https://mattermost.com/security-updates