CVE-2025-8402

Nil pointer dereference in bulk import crashes server

Published Aug 21, 2025 CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
Description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.

Remediation

Vendor Solution

Update Mattermost to versions 10.11.0, 10.8.4, 10.5.9, 9.11.18, 10.10.1, 10.9.4 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-25459 Mattermost has Potential Server Crash due to Unvalidated Import Data
Github GHSA Github GHSA GHSA-h469-4fcf-p23h Mattermost has Potential Server Crash due to Unvalidated Import Data
References
History
Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
cpe:2.3:a:mattermost:mattermost_server:10.10.0:-:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.
Title Nil pointer dereference in bulk import crashes server
Weaknesses CWE-1287
CWE-476
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Aug 21, 2025, 5:30 PM
Reserved
Jul 31, 2025, 12:31 AM
Status
Analyzed
Published
Aug 21, 2025, 5:15 PM
Modified
Jun 17, 2026, 10:06 AM