The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership.
{
"cna_assigner": "Mattermost",
"cwe_ids": [
"CWE-862"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2299.json"
}{
"cpe": [
"cpe:2.3:a:mattermost:google_drive:*:*:*:*:*:mattermost:*:*",
"cpe:2.3:a:mattermost:google_drive:1.1.0:rc1:*:*:*:mattermost:*:*",
"cpe:2.3:a:mattermost:google_drive:1.1.0:rc2:*:*:*:mattermost:*:*"
],
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.1.0"
},
{
"introduced": "1.1.0-rc1"
},
{
"last_affected": "1.1.0-rc1"
},
{
"introduced": "1.1.0-rc2"
},
{
"last_affected": "1.1.0-rc2"
}
],
"source": [
"CPE_RANGE",
"CPE_STRING",
"REFERENCES"
]
}