CVE-2025-9084
Low
Description
Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs
SeverityLow
CVSS3.1
Exploit probability—
Product
Mattermost Server
PublishedSep 15, 2025
First seenSep 15, 2025
Weakness typeCWE-601Open redirect
How to fix
Update
- mattermost mattermost_server10.5.10 or later
- github.com/mattermost/mattermost/server/v88.0.0-202508080704-39bd251fe4f600 or later
- github.com/mattermost/mattermost-server10.5.10, 10.5.10+incompatible or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.5.0 ≤ v < 10.5.10 | 10.5.10 |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-202508080704-39bd251fe4f600, No range specified | 8.0.0-202508080704-39bd251fe4f600 |
| github.com/mattermost/mattermost-serverGo | 10.5.0 ≤ v < 10.5.10, 10.5.0+incompatible ≤ v < 10.5.10+incompatible | 10.5.10, 10.5.10+incompatible |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
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