CVE-2025-6226

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

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::::::::

History

02 Oct 2025, 19:49

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

22 Jul 2025, 13:06

Type	Values Removed	Values Added
Summary		(es) Las versiones de Mattermost 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 no pueden verificar la autorización al recuperar publicaciones en caché mediante PendingPostID, lo que permite que un usuario autenticado lea publicaciones en canales privados a los que no tiene acceso al adivinar el PendingPostID de publicaciones creadas recientemente.

18 Jul 2025, 09:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-07-18 09:15

Updated : 2025-10-02 19:49

NVD link : CVE-2025-6226

Mitre link : CVE-2025-6226

CVE.ORG link : CVE-2025-6226

JSON object : View

Products Affected

mattermost

mattermost_server

CWE

CWE-306

Missing Authentication for Critical Function

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