| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0-rc1, < 10.11.11≥ 10.11.0-rc1+incompatible, < 10.11.11+incompatible≥ 11.2.0-rc1, < 11.2.3≥ 11.2.0-rc1+incompatible, < 11.2.3+incompatible≥ 11.3.0-rc1, < 11.3.1≥ 11.3.0-rc1+incompatible, < 11.3.1+incompatible< 5.3.2-0.20260107144005-c7f6efdfb035 | 10.11.1110.11.11+incompatible11.2.311.2.3+incompatible11.3.111.3.1+incompatible5.3.2-0.20260107144005-c7f6efdfb035 |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260107144005-c7f6efdfb035 | 8.0.0-20260107144005-c7f6efdfb035 |
| mattermost server | ≥ 10.11.0, < 10.11.11≥ 11.2.0, < 11.2.3≥ 11.3.0, < 11.3.1 | 10.11.1111.2.311.3.1 |
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to validate team-specific upload_file permissions which allows a guest user to post files in channels where they lack upload_file permission via uploading files in a team where they have permission and reusing the file metadata in a POST request to a different team. Mattermost Advisory ID: MMSA-2025-00553
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