| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.17≥ 10.11.0+incompatible, < 10.11.17+incompatible≥ 11.5.0, < 11.5.5≥ 11.5.0+incompatible, < 11.5.5+incompatible≥ 11.6.0, < 11.6.1≥ 11.6.0+incompatible, < 11.6.1+incompatible | 10.11.1710.11.17+incompatible11.5.511.5.5+incompatible11.6.111.6.1+incompatible |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 8.0.0-20250731163400-5b955468ea1e, < 8.0.0-20260423180926-c021eeaff8f0 | 8.0.0-20260423180926-c021eeaff8f0 |
| mattermost server | ≥ 10.11.0, < 10.11.17≥ 11.5.0, < 11.5.5≥ 11.6.0, < 11.6.2 | 10.11.17 |
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field. Mattermost Advisory ID: MMSA-2026-00661
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