CVE-2025-11777
BaseFortify
Publication date: 2025-11-13
Last updated on: 2025-11-17
Assigner: Mattermost, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mattermost | mattermost_server | From 10.5.0 (inc) to 10.5.12 (exc) |
| mattermost | mattermost_server | From 10.11.0 (inc) to 10.11.4 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-863 | The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability in Mattermost versions 10.11.x <= 10.11.3 and 10.5.x <= 10.5.11 involves improper validation of team membership permissions in the Add Channel Member API. It allows users from one team to access user metadata and channel membership information from other teams through the API endpoint.
How can this vulnerability impact me? :
The vulnerability can lead to unauthorized access where users from one team can view user metadata and channel membership details of other teams, potentially exposing sensitive information and violating privacy boundaries within the Mattermost platform.