CVE-2023-39960

Name: CVE-2023-39960
Creator: NVD / NIST
Published: 2023-10-13T13:15:11.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2023-39960 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server starting with 25.0.0 and prior to 25.09 and 26.04; as well as Nextcloud Enterprise Server starting with 22.0.0 and prior to 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4; missing protection allows an attacker to brute force passwords on the WebDAV API. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server starting with 25.0.0 and prior to 25.09 and 26.04; as well as Nextcloud Enterprise Server starting with 22.0.0 and prior to 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4; missing protection allows an attacker to brute force passwords on the WebDAV API. Nextcloud Server 25.0.9 and 26.0.4 and Nextcloud Enterprise Server 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, and 26.0.4 contain patches for this issue. No known workarounds are available.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.57%

43.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 22.0.0, < 22.2.10.14
Nextcloud	Nextcloud Server	>= 23.0.0, < 23.0.12.9
Nextcloud	Nextcloud Server	>= 24.0.0, < 24.0.12.5
Nextcloud	Nextcloud Server	>= 25.0.0, < 25.0.9
Nextcloud	Nextcloud Server	>= 26.0.0, < 26.0.4

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2hrc-5fgp-c9c9Vendor Advisory
https://github.com/nextcloud/server/pull/38046Issue Tracking, Patch
https://hackerone.com/reports/1924212Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2hrc-5fgp-c9c9Vendor Advisory
https://github.com/nextcloud/server/pull/38046Issue Tracking, Patch
https://hackerone.com/reports/1924212Third Party Advisory

Timeline

Published: Oct 13, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-39960?

How severe is CVE-2023-39960?

CVE-2023-39960 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2023-39960?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-39960?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST