CVE-2023-39959 Information

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.

Reference

https://hackerone.com/reports/1832126 https://github.com/nextcloud/server/pull/38747 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpj