CVE-2025-8402

Nil pointer dereference in bulk import crashes server

CVSS 4.9 MEDIUMEPSS 0.3%CWE-1287 CWE-476

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

21 Aug 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected products

Mattermost · Mattermost

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References

https://mattermost.com/security-updates