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.
                
            Metrics
Affected Vendors & Products
References
        | Link | Providers | 
|---|---|
| https://mattermost.com/security-updates | 
                     | 
            
History
                    Wed, 17 Sep 2025 11:00:00 +0000
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| First Time appeared | 
        
        Mattermost mattermost
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| Vendors & Products | 
        
        Mattermost mattermost
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Tue, 16 Sep 2025 16:15:00 +0000
| Type | Values Removed | Values Added | 
|---|---|---|
| First Time appeared | 
        
        Mattermost
         Mattermost mattermost Server  | 
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| 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 | 
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| Metrics | 
        
        ssvc
         
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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
         
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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
Updated: 2025-09-15T12:04:08.711Z
Status : Analyzed
Published: 2025-09-15T11:15:34.183
Modified: 2025-09-16T16:00:26.390
Link: CVE-2025-9072
No data.