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CVE-2025-8402

Good to know:

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Date: August 21, 2025

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.

Severity Score

Related Resources (6)

https://github.com/advisories/GHSA-h469-4fcf-p23h
https://github.com/mattermost/mattermost
https://nvd.nist.gov/vuln/detail/CVE-2025-8402
https://pkg.go.dev/vuln/GO-2025-3911
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-8402

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Improper Validation of Specified Type of Input

CWE-1287

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost-server - v10.8.4;github.com/mattermost/mattermost-server - v10.5.9;github.com/mattermost/mattermost-server - v10.9.4;github.com/mattermost/mattermost-server - v10.10.1;github.com/mattermost/mattermost-server - v9.11.18;https://github.com/mattermost/mattermost.git - v10.8.4;https://github.com/mattermost/mattermost.git - v10.5.9;https://github.com/mattermost/mattermost.git - v9.11.18;https://github.com/mattermost/mattermost.git - v10.9.4;https://github.com/mattermost/mattermost.git - v10.10.1

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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