CVE-2025-8402
Medium
Published: 21 August 2025
Published
21 August 2025
Modified
01 October 2025
KEV Added
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Patch
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CVSS Score v3.1
4.9
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0015
34.7th percentile
Risk Priority
10
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2025-8402 is a medium-severity NULL Pointer Dereference (CWE-476) vulnerability in Mattermost Mattermost Server. Its CVSS base score is 4.9 (Medium).
Operationally, ranked at the 34.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-25459
Vulnerability details
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
mattermost
mattermost server
10.10.0 · 9.11.0 — 9.11.18 · 10.5.0 — 10.5.9 · 10.8.0 — 10.8.4
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.