{"id":"CVE-2026-2299","summary":"Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint","details":"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.","modified":"2026-08-13T04:02:15.861299073Z","published":"2026-06-25T18:55:11.905Z","database_specific":{"cna_assigner":"Mattermost","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2299.json"},"references":[{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2299.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2299"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost-plugin-google-drive"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-plugin-google-drive","events":[{"introduced":"0"},{"fixed":"c8e4c79dde1c785d26e2b2eb414f0ae682d63be8"},{"introduced":"2fe647c1bc421a3b6e14ee56f8132e69289a620a"},{"last_affected":"c8e4c79dde1c785d26e2b2eb414f0ae682d63be8"}],"database_specific":{"source":["CPE_RANGE","CPE_STRING","REFERENCES"],"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"}]}}],"versions":["1.1.0-rc1","1.1.0-rc2","v1.1.0-rc2","v1.1.0","v1.1.0-rc1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2299.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}