CVE-2025-8402

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 v3 4.9 MEDIUM

4.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://mattermost.com/security-updates	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server:10.10.0:-::::::

History

01 Oct 2025, 20:23

Type	Values Removed	Values Added
References	~~() https://mattermost.com/security-updates -~~	() https://mattermost.com/security-updates - Vendor Advisory
CPE		cpe:2.3:a:mattermost:mattermost_server:::::::: cpe:2.3:a:mattermost:mattermost_server:10.10.0:-::::::
First Time		Mattermost Mattermost mattermost Server

22 Aug 2025, 18:08

Type	Values Removed	Values Added
Summary		(es) Las versiones de Mattermost 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 no pueden validar los datos de importación, lo que permite que un administrador del sistema bloquee el servidor a través de la función de importación masiva.

21 Aug 2025, 17:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-08-21 17:15

Updated : 2025-10-01 20:23

NVD link : CVE-2025-8402

Mitre link : CVE-2025-8402

CVE.ORG link : CVE-2025-8402

JSON object : View

Products Affected

mattermost

mattermost_server

CWE

CWE-476

NULL Pointer Dereference

CWE-1287

Improper Validation of Specified Type of Input

{"id": "CVE-2025-8402", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "responsibledisclosure@mattermost.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.2}]}, "published": "2025-08-21T17:15:33.093", "references": [{"url": "https://mattermost.com/security-updates", "tags": ["Vendor Advisory"], "source": "responsibledisclosure@mattermost.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "responsibledisclosure@mattermost.com", "description": [{"lang": "en", "value": "CWE-476"}, {"lang": "en", "value": "CWE-1287"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Las versiones de Mattermost 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 no pueden validar los datos de importaci\u00f3n, lo que permite que un administrador del sistema bloquee el servidor a trav\u00e9s de la funci\u00f3n de importaci\u00f3n masiva."}], "lastModified": "2025-10-01T20:23:12.900", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4E2C0E13-B52A-4539-80B6-DC0FE8FF2E56", "versionEndExcluding": "9.11.18", "versionStartIncluding": "9.11.0"}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B95DCAE5-07C2-46B1-B03E-ED3FB9B2C568", "versionEndExcluding": "10.5.9", "versionStartIncluding": "10.5.0"}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BE00156D-6ACB-4F8C-BFFC-03A8127199A4", "versionEndExcluding": "10.8.4", "versionStartIncluding": "10.8.0"}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BB49CDD5-C206-4BEC-8CB5-D757DCC43208", "versionEndExcluding": "10.9.4", "versionStartIncluding": "10.9.0"}, {"criteria": "cpe:2.3:a:mattermost:mattermost_server:10.10.0:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "881B8E63-A35D-4883-A388-E68BD5529883"}], "operator": "OR"}]}], "sourceIdentifier": "responsibledisclosure@mattermost.com"}