| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 11.10.0, < 11.10.2≥ 11.7.0, < 11.7.11≥ 11.8.0, < 11.8.6≥ 11.9.0, < 11.9.2 | 11.10.211.7.1111.8.611.9.2 |
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to limit the length of the post ID array accepted by the bulk reactions endpoint which allows an authenticated user to cause excessive database load via a crafted request to {{POST /api/v4/posts/ids/reactions}}.. Mattermost Advisory ID: MMSA-2026-00771
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