by Kastro
Paper/Archive/CVE-2025-20051

CVE-2025-20051

Mattermost Mattermost — Arbitrary file read via block duplication in Mattermost Boards

EPSS 0.6%CVSS 9.9
critical.is priorityof 100
40
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 49.3.493 × 209.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.

Affected

ProductAffectedFixed inSource
Mattermost10.4.0 – 10.4.110.5.0CNA
Mattermost9.11.0 – 9.11.79.11.8CNA
Mattermost10.3.0 – 10.3.210.5.0CNA
Mattermost10.2.0 – 10.2.210.5.0CNA

Scores by source

Mattermost (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refmattermost.com/security-updates