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CVE-2023-39959

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Date: August 10, 2023

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.

Language: PHP

Severity Score

Related Resources (5)

https://nvd.nist.gov/vuln/detail/CVE-2023-39959
https://hackerone.com/reports/1832126
https://github.com/nextcloud/server/pull/38747
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g97r-8ffm-hfpj
https://www.mend.io/vulnerability-database/CVE-2023-39959

Severity Score

Weakness Type (CWE)

Improper Access Control

CWE-284

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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