CVE-2023-39958 Missing brute force protection on password reset token OAuth2 API controller

What is CVE-2023-39958?

CVE-2023-39958 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 10 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-307

Which versions are affected by CVE-2023-39958?

It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2023-39958?

No fix has been published for CVE-2023-39958 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-39958 being exploited?

There is no known exploitation of CVE-2023-39958 in the wild and no public exploit code.

Other vulnerabilities in Nextcloud Nextcloud Server

• CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server Critical 9.3
• CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server Critical 9.1
• CVE-2018-3775 Auth bypass in Nextcloud Server High 8.8
• CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected High 8.7
• CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended High 8.7

All Nextcloud Nextcloud Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vv27-g2hq-v48h.