{"id":"CVE-2018-21251","aliases":["EUVD-2018-13766","GHSA-594j-4xf7-hx8m"],"status":"published","title":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be...","description":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01197,"percentile":0.68316,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-862"],"published":"2020-06-19T16:49:18Z","modified":"2026-10-24T10:30:40Z","products":[{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-21251"},{"url":"https://github.com/advisories/GHSA-594j-4xf7-hx8m"}],"sources":{"cve":[{"id":"CVE-2018-21251","description":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.","status":"published","published":"2020-06-19T16:49:18Z","modified":"2024-08-05T12:26:39.379Z","updated_at":"2026-11-02T14:35:02.289647Z"}],"euvd":[{"id":"EUVD-2018-13766","description":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.","status":"published","published":"2020-06-19T16:49:18Z","modified":"2024-08-05T12:26:39Z","updated_at":"2026-11-03T02:39:27.875919Z"}],"ghsa":[{"id":"GHSA-594j-4xf7-hx8m","title":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be...","description":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.","status":"published","published":"2022-05-24T17:21:08Z","modified":"2023-01-29T05:02:56Z","updated_at":"2026-11-02T14:45:12.348503Z"}],"nvd":[{"id":"CVE-2018-21251","description":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.","status":"published","published":"2020-06-19T17:15:12.49Z","modified":"2026-06-17T01:54:28.367Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:05:00.03074Z"}],"osv":[{"id":"CVE-2018-21251","description":"An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.","status":"published","published":"2020-06-19T17:15:12.49Z","modified":"2026-10-24T10:30:40.558139249Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:09.145458Z"}]}}