CVE-2018-3761

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.

• CWE-287
• CWE-287

• https://hackerone.com/reports/343111Third Party Advisory
• https://nextcloud.com/security/advisory/?id=nc-sa-2018-003Broken Link, Vendor Advisory
• https://hackerone.com/reports/343111Third Party Advisory
• https://nextcloud.com/security/advisory/?id=nc-sa-2018-003Broken Link, Vendor Advisory

Published

Jul 5, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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