CVE-2025-55073

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact LOW

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::::::::

History

19 Oct 2026, 13:10

Type	Values Removed	Values Added
Summary		(es) Las versiones de Mattermost 10.11.x menor o igual que 10.11.3, 10.5.x menor o igual que 10.5.11, 10.12.x menor o igual que 10.12.0 no validan la relación entre la publicación que se está actualizando y el flujo OAuth del plugin de MSTeams, lo que permite a un atacante editar publicaciones arbitrarias a través de una URL de redirección OAuth del plugin de MSTeams manipulada.

Information

Published : 2025-11-14 08:15

Updated : 2026-10-19 13:10

NVD link : CVE-2025-55073

Mitre link : CVE-2025-55073

CVE.ORG link : CVE-2025-55073

JSON object : View

Products Affected

mattermost

mattermost_server

CWE

CWE-306

Missing Authentication for Critical Function

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