| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0+incompatible, < 10.11.14+incompatible≥ 11.5.0+incompatible, < 11.5.2+incompatible< 5.3.2-0.20260325160634-e738016c5920 | 10.11.14+incompatible11.5.2+incompatible5.3.2-0.20260325160634-e738016c5920 |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 10.11.0, < 10.11.14≥ 11.5.0, < 11.5.2< 8.0.0-20260325160634-e738016c5920 | 10.11.1411.5.28.0.0-20260325160634-e738016c5920 |
| mattermost server | ≥ 10.11.0, < 10.11.14≥ 11.5.0, < 11.5.2 | 10.11.1411.5.2 |
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost Advisory ID: MMSA-2026-00582
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