Go/github.com/mattermost/mattermost-server CVE-2026-4286: medium 4.3, EPSS 0.14%
Mattermost doesn't check if {{team_id}} was being changed when updating playbooks in github.com/mattermost/mattermost-plugin-playbooks
Action: Upgrade github.com/mattermost/mattermost-server to 10.11.14+incompatible or later.
go get github.com/mattermost/mattermost-server@v10.11.14+incompatiblego get github.com/mattermost/mattermost-server@v11.5.2+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 10.11.0+incompatible | 10.11.14+incompatible | - |
| 11.5.0+incompatible | 11.5.2+incompatible | - |
Fixed versions
| 10.11.14+incompatible | 11.5.2+incompatible |
Sources
- osv: GO-2026-5404#Go/github.com/mattermost/mattermost-server
- nvd: CVE-2026-4286
- https://github.com/advisories/GHSA-gvg4-jhmr-6j23
- https://github.com/mattermost/mattermost-plugin-playbooks/commit/e1d6ec2c94e695fb74e0c0c11c0d45e028bb96f3
- https://mattermost.com/security-updates
CVE-2026-4286 · published · modified · JSON