GHSA-4276-cm8c-788h

ghsaUSosv

Mattermost Fails to Properly Validate Team Role Modification

view advisory published 2025-08-21Licence: CC-BY-4.0

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2025-53971US	—OT elevated	0.20% (10th)	—	2025-08-21
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members t…

references

External citations — patches, advisories, analysis.

https://github.com/mattermost/mattermostPACKAGE
https://mattermost.com/security-updatesWEB
https://nvd.nist.gov/vuln/detail/CVE-2025-53971ADVISORY
https://pkg.go.dev/vuln/GO-2025-3902WEB

scry

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