CVE-2025-9072 - CVE House
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Status published High CVE-2025-9072

One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • DoyenSec

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.10.0, 10.5.0, 10.9.0, 10.11.0, 10.10.2, 10.5.10, 10.9.5

Timeline

Official Publish: September 15th, 2025
Last Modified: September 15th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

Weaknesses (CWE)

CWE-601

MITRE ATT&CK TTPs

T1566 Phishing
Initial Access
T1204 User Execution
Execution
T1071 Application Layer Protocol
Command and Control
T1189 Drive-by Compromise
Initial Access
T1036 Masquerading
Defense Evasion