GHSA-m79q-8qf5-v622

ghsaUSosv

Mattermost doesn't check public/private permissions

view advisory published 2026-05-18Licence: CC-BY-4.0

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-6343US	—OT elevated	0.17% (6th)	—	2026-05-18
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public…

references

External citations — patches, advisories, analysis.

https://github.com/mattermost/mattermostPACKAGE
https://github.com/mattermost/mattermost-plugin-playbooks/commit/887d9cacb61655d40f20ad9d6e35b408a127c380WEB
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-6343ADVISORY

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