CVE-2026-6343

Description

Mattermost doesn't check public/private permissions in github.com/mattermost/mattermost-plugin-playbooks

How to fix CVE-2026-6343

To remediate CVE-2026-6343, upgrade the affected package to a fixed version below.

• Go/github.com/mattermost/mattermost-plugin-playbooks—upgrade to 1.41.1-0.20260309184833-887d9cacb616 or later
• —upgrade to 1.41.1-0.20260309184833-887d9cacb616 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-2026-6343 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

• from 0, < 1.41.1-0.20260309184833-887d9cacb616
• from 0, < 1.41.1-0.20260309184833-887d9cacb616
• >= 10.11.0+incompatible, < 10.11.14+incompatible, >= 11.4.0+incompatible, < 11.4.4+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-m79q-8qf5-v622
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-6343
• PATCHgithub.com/mattermost/mattermost
• WEBgithub.com/mattermost/mattermost-plugin-playbooks/commit/887d9cacb61655d40f20ad9d6e35b408a127c380