Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration
{
"cna_assigner": "Mattermost",
"cwe_ids": [
"CWE-639"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9081.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"introduced": "10.5.0"
},
{
"last_affected": "10.5.8"
},
{
"introduced": "9.11.0"
},
{
"last_affected": "9.11.17"
}
],
"source": "AFFECTED_FIELD"
}
]
}{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"extracted_events": [
{
"introduced": "9.11.0"
},
{
"fixed": "9.11.17"
},
{
"introduced": "10.5.0"
},
{
"fixed": "10.5.9"
}
],
"source": "CPE_RANGE"
}