Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost-server(Go) | 10.11.0 | 10.11.4 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.5.0 | 10.5.12 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.12.0 | 10.12.1 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250929212932-a41db04d2746 | N/A |
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