{"id":"CVE-2026-2299","aliases":["EUVD-2026-39540","GHSA-m2c6-qhf9-2xm8"],"status":"published","title":"Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint","description":"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.","severity":{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00201,"percentile":0.10034,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-862"],"published":"2026-06-25T18:55:11Z","modified":"2026-10-28T02:30:35Z","products":[{"vendor":"mattermost","product":"google_drive"},{"vendor":"mattermost","product":"mattermost google drive plugin"}],"references":[{"url":"https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0","tags":["Product","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2299","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-m2c6-qhf9-2xm8"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2299.json","tags":["advisory"]},{"url":"https://github.com/mattermost/mattermost-plugin-google-drive","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-2299","title":"Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint","description":"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.","status":"published","published":"2026-06-25T18:55:11.905Z","modified":"2026-06-26T14:05:09.476Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T13:48:46.911326Z"}],"euvd":[{"id":"EUVD-2026-39540","description":"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.","status":"published","published":"2026-06-25T18:55:11Z","modified":"2026-06-26T14:05:09Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:20:24.495602Z"}],"ghsa":[{"id":"GHSA-m2c6-qhf9-2xm8","title":"The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in...","description":"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.","status":"published","published":"2026-06-25T21:31:31Z","modified":"2026-06-25T21:31:38Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:08:59.328511Z"}],"nvd":[{"id":"CVE-2026-2299","description":"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.","status":"published","published":"2026-06-25T20:17:10.763Z","modified":"2026-10-25T22:10:00.15Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:26.045561Z"}],"osv":[{"id":"CVE-2026-2299","title":"Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint","description":"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.","status":"published","published":"2026-06-25T18:55:11.905Z","modified":"2026-10-28T02:30:35.600338678Z","cvss":[{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:44:58.749922Z"}]}}