GHSA-6cfr-wp44-6qmv

ghsaUSosv

Mattermost has an Incorrect Authorization issue

view advisory published 2026-05-21Licence: CC-BY-4.0

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-4055US	—OT elevated	0.15% (4th)	—	2026-05-21
Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team membe…

references

External citations — patches, advisories, analysis.

https://github.com/mattermost/mattermostPACKAGE
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2026-4055ADVISORY

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