Channel and Team Membership APIs inadvertently allow loss of Member privileges.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mattermost | Mattermost | unaffected |
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Configuration 1 [-]
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | — |
Vendor Solution
Update Mattermost to versions 10.10.0, 10.5.9, 9.11.18 or higher.
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-25413 | Mattermost Fails to Properly Validate Team Role Modification |
Github GHSA |
GHSA-4276-cm8c-788h | Mattermost Fails to Properly Validate Team Role Modification |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.222% probability within 30 days)
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Channel and Team Membership APIs inadvertently allow loss of Member privileges. | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV3_1
|