CVE-2026-4286

Description

Mattermost doesn't check if {{team_id}} was being changed when updating playbooks in github.com/mattermost/mattermost-plugin-playbooks

How to fix CVE-2026-4286

To remediate CVE-2026-4286, upgrade the affected package to a fixed version below.

• Go/github.com/mattermost/mattermost-plugin-playbooks—upgrade to 1.41.1-0.20260213020129-e1d6ec2c94e6 or later
• —upgrade to 1.41.1-0.20260213020129-e1d6ec2c94e6 or later
• —upgrade to 10.11.14+incompatible or later
• —no fix listed
• —no fix listed
• —upgrade to 11.5.2 or later
• —no fix listed

Is CVE-2026-4286 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

• from 0, < 1.41.1-0.20260213020129-e1d6ec2c94e6
• from 0, < 1.41.1-0.20260213020129-e1d6ec2c94e6
• >= 10.11.0+incompatible, < 10.11.14+incompatible, >= 11.5.0+incompatible, < 11.5.2+incompatible
• from 0
• from 0
• >= 11.5.0, < 11.5.2
• from 0

CVSS scores

References (5)

• ADVISORYgithub.com/advisories/GHSA-gvg4-jhmr-6j23
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-4286
• PATCHgithub.com/mattermost/mattermost
• WEBgithub.com/mattermost/mattermost-plugin-playbooks/commit/e1d6ec2c94e695fb74e0c0c11c0d45e028bb96f3