CVE-2026-3108HIGH 8.8EPSS p18.2%

CVE-2026-3108CVE-2026-3108

Description

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 sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences that enable screen manipulation, fake prompts, and clipboard hijacking.. Mattermost Advisory ID: MMSA-2026-00599

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS0.27% probability of exploitation · percentile 18.2% · 2026-06-19T12:03:05Z
Published2026-03-26
Last modified2026-03-30

Underlying weaknesses· 1

CWE-150

References

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

1

TypeTargetConfidenceTier
WeaknessImproper Neutralization of Escape, Meta, or Control Sequencescwe-1500%live

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