CVE-2025-10545
Fixed in a distro release EPSS <1%CVSS 3.1
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
Products: Mattermost
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.5.11 |
| Go | github.com/mattermost/mattermost-server | 10.11.3 |
| Go | github.com/mattermost/mattermost-server | 10.5.11+incompatible |
| Go | github.com/mattermost/mattermost-server | 10.11.3+incompatible |
| Go | github.com/mattermost/mattermost-server/v5 | no fix |
| Go | github.com/mattermost/mattermost-server/v6 | no fix |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250820115038-ff30b84049f0 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 |
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20251105T184115-1.1 |