CVE-2023-39959 Existence of calendars and address books can be checked by unauthenticated users
Unauthenticated attackers can determine the existence of specific calendars or address books via DAV requests, leaking user data structure information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-39959?
CVE-2023-39959 is a low-severity vulnerability in Nextcloud Nextcloud Server, published on 10 Aug 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.9, 26.0.4, and 27.0.1, unauthenticated users could send a DAV request which reveals whether a calendar or an address book with the given identifier exists for the victim. Nextcloud Server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.
Weakness: CWE-284
Which versions are affected by CVE-2023-39959?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2023-39959?
No fix has been published for CVE-2023-39959 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-39959 being exploited?
There is no known exploitation of CVE-2023-39959 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-g97r-8ffm-hfpj.