CVE-2023-39960 Nextcloud Server has improper restriction of excessive authentication attempts on WebDAV endpoint
Attackers can brute force passwords on the WebDAV API due to missing rate limiting, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-39960?
CVE-2023-39960 is a medium-severity authentication bypass vulnerability in Nextcloud Nextcloud Server, published on 13 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server starting with 25.0.0 and prior to 25.09 and 26.04; as well as Nextcloud Enterprise Server starting with 22.0.0 and prior to 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4; missing protection allows an attacker to brute force passwords on the WebDAV API. Nextcloud Server 25.0.9 and 26.0.4 and Nextcloud Enterprise Server 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4 contain patches for this issue. No known workarounds are available.
Weakness: CWE-307
Which versions are affected by CVE-2023-39960?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2023-39960?
No fix has been published for CVE-2023-39960 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-39960 being exploited?
There is no known exploitation of CVE-2023-39960 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
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-2hrc-5fgp-c9c9.