Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to properly validate permissions for the API endpoint /plugins/playbooks/api/v0/signal/keywords/ignore-thread, allowing any user or attacker to delete posts containing actions created by the Playbooks bot, even without channel access or appropriate permissions.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost-plugin-playbooks(Go) | 2.0.0 | N/A | N/A |
| github.com/mattermost/mattermost-plugin-playbooks(Go) | 0 | 1.41.0 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250218121836-2b5275d87136 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.4.0 | N/A | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.5.0 | N/A | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.11.0 | N/A | N/A |
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