CVE-2025-8402

mediumpriority · track · 0EPSS 0.003 · 25 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.32% (25th) EPSS

CVSS 4.9 · medium

Is it mine?

47 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

4.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · responsibledisclosure@mattermost.comexploitability 1.2 · impact 3.6

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.14.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1287USCWE-476USCWE-476US

affected products (47)

Products and version ranges known to be affected.

Mattermost Mattermost Plugins <10.5.9all versionscert_bundDE
Mattermost Mattermost Server <10.10.0all versionscert_bundDE
Mattermost Mattermost Server <10.10.1all versionscert_bundDE
Mattermost Mattermost Server <10.11.0all versionscert_bundDE
Mattermost Mattermost Server <10.5.9all versionscert_bundDE
Mattermost Mattermost Server <10.8.4all versionscert_bundDE
Mattermost Mattermost Server <10.9.2all versionscert_bundDE
Mattermost Mattermost Server <10.9.3all versionscert_bundDE
Mattermost Mattermost Server <10.9.4all versionscert_bundDE
Mattermost Mattermost Server <9.11.18all versionscert_bundDE
Mattermost Mattermost≤ Server <9.11.18cert_bundDE
Mattermost Mattermost≤ Plugins <10.5.9cert_bundDE
Mattermost Mattermost≤ Server <10.10.0cert_bundDE
Mattermost Mattermost≤ Server <10.10.1cert_bundDE
Mattermost Mattermost≤ Server <10.11.0cert_bundDE
Mattermost Mattermost≤ Server <10.5.9cert_bundDE
Mattermost Mattermost≤ Server <10.8.4cert_bundDE
Mattermost Mattermost≤ Server <10.9.2cert_bundDE
Mattermost Mattermost≤ Server <10.9.3cert_bundDE
Mattermost Mattermost≤ Server <10.9.4cert_bundDE

showing 20 of 47

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1625Mattermost Server und Plugins: Mehrere SchwachstellenDeutsch2025-07-22csaf · cert_bundDE
Ein authentifizierter Angreifer mit bestimmten Berechtigungen kann diese Schwachstellen ausnutzen, um Sicherheitsmechanismen zu umgehen, beliebige Dateien in das Dateisystem einzubringen und potenziell beliebigen Code auszuführen.
GHSA-h469-4fcf-p23hMattermost has Potential Server Crash due to Unvalidated Import Data2025-08-21ghsa · osvUS
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.
GO-2025-3911Mattermost has Potential Server Crash due to Unvalidated Import Data in github.com/mattermost/mattermost-server2025-08-29vendor · osvUS
Mattermost has Potential Server Crash due to Unvalidated Import Data in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/mattermost/mattermost/server/v8 before v8.0.0-20250708173752-d6b35c41f0ae5.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund NVD CVE.org MITRE

published 2025-08-21modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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