CVE-2023-39958

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, missing protection allows an attacker to brute force the client secrets of configured OAuth2 clients. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

• CWE-307

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-vv27-g2hq-v48hVendor Advisory
• https://github.com/nextcloud/server/pull/38773Patch, Vendor Advisory
• https://hackerone.com/reports/1258448Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-vv27-g2hq-v48hVendor Advisory
• https://github.com/nextcloud/server/pull/38773Patch, Vendor Advisory
• https://hackerone.com/reports/1258448Third Party Advisory

Published

Aug 10, 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.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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