CVE-2025-8402 — NULL Pointer Dereference in Mattermost Mattermost-server

CWE-476 — NULL Pointer DereferenceCWE-1287 — Improper Validation of Specified Type of Input5 documents4 sources
Severity
4.9MEDIUMNVD
EPSS
0.1%
top 70.91%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
6
Github.com Mattermost Mattermost-serverGithub.com Mattermost Mattermost Server V8Mattermost Server+3 more
Timeline
PublishedAug 21
Latest updateAug 29

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:HExploitability: 1.2 | Impact: 3.6

Affected Packages6 packages

▶NVDmattermost/mattermost_server9.11.0 — 9.11.18+4
▶Gogithub.com/mattermost_mattermost-server9.11.0+incompatible — 9.11.18+incompatible+9
▶Gogithub.com/mattermost_mattermost_server_v8< 8.0.0-20250708173752-d6b35c41f0ae5

🔴Vulnerability Details

4
OSV
Mattermost has Potential Server Crash due to Unvalidated Import Data in github.com/mattermost/mattermost-server↗2025-08-29
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GHSA
Mattermost has Potential Server Crash due to Unvalidated Import Data↗2025-08-21
▶
OSV
Mattermost has Potential Server Crash due to Unvalidated Import Data↗2025-08-21
▶
CVEList
Nil pointer dereference in bulk import crashes server↗2025-08-21
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CVE-2025-8402 — NULL Pointer Dereference | cvebase