CVE-2026-3109EPSS p21.9%

CVE-2026-3109CVE-2026-3109

mattermost / mattermost_server

Description

Mattermost Plugins versions <=11.4 10.11.11.0 fail to validate webhook request timestamps which allows an attacker to corrupt Zoom meeting state in Mattermost via replayed webhook requests. Mattermost Advisory ID: MMSA-2026-00584

Scoring

CVSS 2.2 ()
VectorCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
EPSS0.30% probability of exploitation · percentile 21.9% · 2026-06-19T12:03:05Z
Last modified2026-06-08

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.