CVE-2023-28848

user_oidc is the OIDC connect user backend for Nextcloud, an open source collaboration platform. A vulnerability in versions 1.0.0 until 1.3.0 effectively allowed an attacker to bypass the state protection as they could just copy the expected state token from the first request to their second request. Users should upgrade user_oidc to 1.3.0 to receive a patch for the issue. No known workarounds are available.

• CWE-352

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-52hv-xw32-wf7fVendor Advisory
• https://github.com/nextcloud/user_oidc/pull/580Patch, Vendor Advisory
• https://hackerone.com/reports/1878381Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-52hv-xw32-wf7fVendor Advisory
• https://github.com/nextcloud/user_oidc/pull/580Patch, Vendor Advisory
• https://hackerone.com/reports/1878381Third Party Advisory

Published

Apr 4, 2023

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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