| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 10.11.0, < 10.11.23≥ 11.7.0, < 11.7.8≥ 11.8.0, < 11.8.5≥ 11.9.0, < 11.9.1 | 10.11.2311.7.811.8.511.9.1 |
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate the type of `fields.properties` on block creation which allows an authenticated user with editor access to a board to crash the Boards plugin worker and trigger a denial of service via a child block whose `fields.properties` is a non-object value. Mattermost Advisory ID: MMSA-2026-00710
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