CVE-2023-28835

Name: CVE-2023-28835
Creator: NVD / NIST
Published: 2023-03-30T19:15:07.02+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2023-28835 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Nextcloud server is an open source home cloud implementation. In affected versions the generated fallback password when creating a share was using a weak complexity random number generator, so when the sharer did not change it the password could be guessable to an attacker willing to brute force it. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

Nextcloud server is an open source home cloud implementation. In affected versions the generated fallback password when creating a share was using a weak complexity random number generator, so when the sharer did not change it the password could be guessable to an attacker willing to brute force it. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. This issue only affects users who do not have a password policy enabled, so enabling a password policy is an effective mitigation for users unable to upgrade.

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

0.54%

41.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-338

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 23.0.0, < 23.0.14
Nextcloud	Nextcloud Server	>= 24.0.0, < 24.0.10
Nextcloud	Nextcloud Server	>= 25.0.0, < 25.0.4

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9Vendor Advisory
https://github.com/nextcloud/server/pull/36093Issue Tracking, Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9Vendor Advisory
https://github.com/nextcloud/server/pull/36093Issue Tracking, Patch

Timeline

Published: Mar 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-28835?

How severe is CVE-2023-28835?

CVE-2023-28835 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2023-28835?

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-2023-28835?

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

Scan your code now

Source: NVD / NIST