CVE-2026-2454HIGH 8.6EPSS p19.0%

CVE-2026-2454CVE-2026-2454

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537

Scoring

CVSS 3.18.6 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS0.27% probability of exploitation · percentile 19.0% · 2026-06-18T12:00:27Z
Published2026-03-16
Last modified2026-03-18

Underlying weaknesses· 1

CWE-1287

References

  1. https://mattermost.com/security-updates

1

TypeTargetConfidenceTier
WeaknessImproper Validation of Specified Type of Inputcwe-12870%live

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