CVE-2025-9072
High
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.
SeverityHigh
CVSS7.6
Exploit probability7. percentile0.2%
Product
Mattermost Server
PublishedSep 15, 2025
First seenSep 15, 2025
Weakness typeCWE-601Open redirect
How to fix
Update
- mattermost mattermost_server10.5.10, 10.9.5, 10.10.2 or later
- github.com/mattermost/mattermost-server10.10.2, 10.5.10, 10.9.5, 10.5.10+incompatible, 10.9.5+incompatible, 10.10.2+incompatible or later
- github.com/mattermost/mattermost/server/v88.0.0-20250731063404-9eebaadf8f72 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.5.0 ≤ v < 10.5.10, 10.9.0 ≤ v < 10.9.5, 10.10.0 ≤ v < 10.10.2 | 10.5.10, 10.9.5, 10.10.2 |
| github.com/mattermost/mattermost-serverGo | 10.10.0 ≤ v < 10.10.2, 10.5.0 ≤ v < 10.5.10, 10.9.0 ≤ v < 10.9.5, 10.5.0+incompatible ≤ v < 10.5.10+incompatible, 10.9.0+incompatible ≤ v < 10.9.5+incompatible, 10.10.0+incompatible ≤ v < 10.10.2+incompatible | 10.10.2, 10.5.10, 10.9.5, 10.5.10+incompatible, 10.9.5+incompatible, 10.10.2+incompatible |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20250731063404-9eebaadf8f72 | 8.0.0-20250731063404-9eebaadf8f72 |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
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