Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.

CVE-2023-39959 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CNA: [email protected]CVSS-B:3.5 LOWVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpj	CVE	Vendor Advisory
https://github.com/nextcloud/server/pull/38747	CVE	Patch
https://hackerone.com/reports/1832126	CVE	Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpj	[email protected]	Vendor Advisory
https://github.com/nextcloud/server/pull/38747	[email protected]	Patch
https://hackerone.com/reports/1832126	[email protected]	Permissions Required

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-284	Improper Access Control	[email protected]

Affected Products

Product	Versions
nextcloud nextcloud server	>= 25.0.0, < 25.0.9 >= 26.0.0, < 26.0.4 27.0.0
CPE cpe:2.3:a:nextcloud:nextcloud_server:::::-:::* cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::* cpe:2.3:a:nextcloud:nextcloud_server:27.0.0::::-::: cpe:2.3:a:nextcloud:nextcloud_server:27.0.0::::enterprise::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Aug 16, 2023	Initial Analysis	[email protected]