Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.
{
"cwe_ids": [
"CWE-863"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/4xxx/CVE-2025-4128.json",
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"source": "AFFECTED_FIELD",
"extracted_events": [
{
"introduced": "10.5.0"
},
{
"last_affected": "10.5.4"
},
{
"introduced": "9.11.0"
},
{
"last_affected": "9.11.13"
}
]
}
]
}