What is CVE-2023-39959?

CVE-2023-39959 is a vulnerability in Nextcloud Server that allows unauthenticated users to reveal whether a calendar or address book with a specific identifier exists.

What is the severity of CVE-2023-39959?

The severity of CVE-2023-39959 is medium with a CVSS score of 5.3.

Which versions of Nextcloud Server are affected by CVE-2023-39959?

Nextcloud Server versions 25.0.0 to 25.0.9, 26.0.0 to 26.0.4, and 27.0.0 are affected by CVE-2023-39959.

How can unauthenticated users exploit CVE-2023-39959?

Unauthenticated users can exploit CVE-2023-39959 by sending a DAV request to determine the existence of a calendar or address book.

Are there any fixes available for CVE-2023-39959?

Yes, fixes for CVE-2023-39959 are available in versions 25.0.9, 26.0.4, and 27.0.1 of Nextcloud Server.

Vulnerability/
CVE-2023-39959

medium

5.3

CWE

284

10/8/2023

16/8/2023

CVE-2023-39959

First published: Thu Aug 10 2023(Updated: )

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.

Credit: security-advisories@github.com security-advisories@github.com

Affected Software	Affected Version	How to fix
Nextcloud Nextcloud Server	>=25.0.0<25.0.9
Nextcloud Nextcloud Server	>=25.0.0<25.0.9
Nextcloud Nextcloud Server	>=26.0.0<26.0.4
Nextcloud Nextcloud Server	>=26.0.0<26.0.4
Nextcloud Nextcloud Server	=27.0.0
Nextcloud Nextcloud Server	=27.0.0

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is CVE-2023-39959?
CVE-2023-39959 is a vulnerability in Nextcloud Server that allows unauthenticated users to reveal whether a calendar or address book with a specific identifier exists.
What is the severity of CVE-2023-39959?
The severity of CVE-2023-39959 is medium with a CVSS score of 5.3.
Which versions of Nextcloud Server are affected by CVE-2023-39959?
Nextcloud Server versions 25.0.0 to 25.0.9, 26.0.0 to 26.0.4, and 27.0.0 are affected by CVE-2023-39959.
How can unauthenticated users exploit CVE-2023-39959?
Unauthenticated users can exploit CVE-2023-39959 by sending a DAV request to determine the existence of a calendar or address book.
Are there any fixes available for CVE-2023-39959?
Yes, fixes for CVE-2023-39959 are available in versions 25.0.9, 26.0.4, and 27.0.1 of Nextcloud Server.

agent/author
agent/description
agent/event
agent/first-publish-date
agent/last-modified-date
agent/references
agent/remedy
agent/severity
agent/softwarecombine
agent/tags
agent/type
agent/weakness
collector/nvd-api
collector/nvd-index
vendor/nextcloud
canonical/nextcloud nextcloud server
version/nextcloud nextcloud server/25.0.0
version/nextcloud nextcloud server/26.0.0
version/nextcloud nextcloud server/27.0.0

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.