Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.
References
History

Wed, 17 Sep 2025 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost
Vendors & Products Mattermost mattermost

Tue, 16 Sep 2025 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost
Mattermost mattermost Server

Mon, 15 Sep 2025 12:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 15 Sep 2025 10:45:00 +0000

Type Values Removed Values Added
Description Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.
Title One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
Weaknesses CWE-601
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published: 2025-09-15T10:28:17.356Z

Updated: 2025-09-15T12:06:57.518Z

Reserved: 2025-08-15T14:59:12.540Z

Link: CVE-2025-9072

cve-icon Vulnrichment

Updated: 2025-09-15T12:04:08.711Z

cve-icon NVD

Status : Analyzed

Published: 2025-09-15T11:15:34.183

Modified: 2025-09-16T16:00:26.390

Link: CVE-2025-9072

cve-icon Redhat

No data.