CVE-2023-28847

Name: CVE-2023-28847
Creator: NVD / NIST
Published: 2023-04-25T17:15:08.963+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.77%

Last modified Jun 17, 2026

CVE-2023-28847 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. In Nextcloud Server 24.0.0 prior to 24.0.11 and 25.0.0 prior to 25.0.5; as well as Nextcloud Server Enterprise 23.0.0 prior to 23.0.12.6, 24.0.0 prior to 24.0.11, and 25.0.0 prior to 25.0.5; an attacker is not restricted in verifying passwords of share links so they can just start brute forcing the password. EPSS estimates a 0.77% chance of exploitation in the next 30 days.

Description

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform. In Nextcloud Server 24.0.0 prior to 24.0.11 and 25.0.0 prior to 25.0.5; as well as Nextcloud Server Enterprise 23.0.0 prior to 23.0.12.6, 24.0.0 prior to 24.0.11, and 25.0.0 prior to 25.0.5; an attacker is not restricted in verifying passwords of share links so they can just start brute forcing the password. Nextcloud Server 24.0.11 and 25.0.5 and Nextcloud Enterprise Server 23.0.12.6, 24.0.11, and 25.0.5 contain a fix 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

0.77%

51.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 23.0.0, < 23.0.12.6
Nextcloud	Nextcloud Server	>= 24.0.0, < 24.0.11
Nextcloud	Nextcloud Server	>= 25.0.0, < 25.0.5

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r5wf-xj97-3w7wVendor Advisory
https://github.com/nextcloud/server/pull/35057Issue Tracking, Patch
https://hackerone.com/reports/1894653Exploit, Issue Tracking, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r5wf-xj97-3w7wVendor Advisory
https://github.com/nextcloud/server/pull/35057Issue Tracking, Patch
https://hackerone.com/reports/1894653Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Apr 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-28847?

How severe is CVE-2023-28847?

CVE-2023-28847 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.77% probability of exploitation in the next 30 days.

How do I fix CVE-2023-28847?

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-2023-28847?

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

Scan your code now

Source: NVD / NIST