medium6.5
CVE-2025-6226
Mattermost Missing Authentication for Critical Function
Impact
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >= 10.5.0, < 10.5.7 | 10.5.7 |
| go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250520130510-fa40a8c5d47f | 8.0.0-20250520130510-fa40a8c5d47f |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Server | from 9.11.0 before 9.11.17 from 10.5.0 before 10.5.7 from 10.7.0 before 10.7.4 from 10.8.0 before 10.8.2 |