Unrated severityNVD Advisory· Published Aug 10, 2023· Updated Oct 8, 2024
Existence of calendars and address books can be checked by unauthenticated users
CVE-2023-39959
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.
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Affected products
2- Range: >=25.0.0, <25.0.9 || >=26.0.0, <26.0.4 || >=27.0.0, <27.0.1
- nextcloud/security-advisoriesv5Range: >= 25.0.0, < 25.0.9
Patches
Vulnerability mechanics
References
3- github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpjmitrex_refsource_CONFIRM
- github.com/nextcloud/server/pull/38747mitrex_refsource_MISC
- hackerone.com/reports/1832126mitrex_refsource_MISC
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