| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.15≥ 10.11.0+incompatible, < 10.11.15+incompatible≥ 11.4.0, < 11.4.5≥ 11.4.0+incompatible, < 11.4.5+incompatible≥ 11.5.0, < 11.5.4≥ 11.5.0+incompatible, < 11.5.4+incompatible≥ 11.6.0, < 11.6.1≥ 11.6.0+incompatible, < 11.6.1+incompatible | 10.11.1510.11.15+incompatible11.4.511.4.5+incompatible11.5.411.5.4+incompatible11.6.111.6.1+incompatible |
| mattermost server | ≥ 10.11.0, < 10.11.15≥ 11.4.0, < 11.4.5≥ 11.5.0, < 11.5.4≥ 11.6.0, < 11.6.1 | 10.11.1511.4.511.5.411.6.1 |
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, which allows an authenticated user to access and download files belonging to other users or teams via crafted Boards API requests using valid file IDs. Mattermost Advisory ID: MMSA-2026-00620.
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free