{"id":"CVE-2018-3761","aliases":["EUVD-2018-15567","GHSA-frc3-rhfw-jxf5"],"status":"published","title":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token...","description":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01657,"percentile":0.76773,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2018-07-05T16:00:00Z","modified":"2026-10-24T10:30:49Z","products":[{"vendor":"hackerone","product":"nextcloud server"},{"vendor":"nextcloud","product":"nextcloud server"},{"vendor":"nextcloud","product":"nextcloud_server"}],"references":[{"url":"https://hackerone.com/reports/343111","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nextcloud.com/security/advisory/?id=nc-sa-2018-003","tags":["x_refsource_CONFIRM","x_transferred","Broken Link","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-3761"},{"url":"https://github.com/advisories/GHSA-frc3-rhfw-jxf5"}],"sources":{"cve":[{"id":"CVE-2018-3761","description":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.","status":"published","published":"2018-07-05T16:00:00Z","modified":"2024-08-05T04:50:30.619Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:35:05.619113Z"}],"euvd":[{"id":"EUVD-2018-15567","description":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.","status":"published","published":"2018-07-05T16:00:00Z","modified":"2024-08-05T04:50:30Z","updated_at":"2026-11-03T02:40:15.208866Z"}],"ghsa":[{"id":"GHSA-frc3-rhfw-jxf5","title":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token...","description":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.","status":"published","published":"2022-05-13T01:32:20Z","modified":"2023-02-01T05:08:05Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:50:40.636216Z"}],"nvd":[{"id":"CVE-2018-3761","description":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.","status":"published","published":"2018-07-05T16:29:00.407Z","modified":"2026-06-17T01:57:47.213Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:04:31.362791Z"}],"osv":[{"id":"CVE-2018-3761","description":"Nextcloud Server before 12.0.8 and 13.0.3 suffer from improper authentication on the OAuth2 token endpoint. Missing checks potentially allowed handing out new tokens in case the OAuth2 client was partly compromised.","status":"published","published":"2018-07-05T16:29:00.407Z","modified":"2026-10-24T10:30:49.818045255Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:09.442568Z"}]}}