CVE-2023-35928

Name: CVE-2023-35928
Creator: NVD / NIST
Published: 2023-06-23T21:15:10.007+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.98%

Last modified Jun 17, 2026

CVE-2023-35928 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. EPSS estimates a 0.98% chance of exploitation in the next 30 days.

Description

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2. Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.98%

57.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-274

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 19.0.0, < 19.0.13.9
Nextcloud	Nextcloud Server	>= 20.0.0, < 20.0.14.14
Nextcloud	Nextcloud Server	>= 21.0.0, < 21.0.9.12
Nextcloud	Nextcloud Server	>= 22.0.0, < 22.2.10.12
Nextcloud	Nextcloud Server	>= 23.0.0, < 23.0.12.7
Nextcloud	Nextcloud Server	>= 24.0.0, < 24.0.12.2
Nextcloud	Nextcloud Server	>= 25.0.0, < 25.0.7
Nextcloud	Nextcloud Server	>= 26.0.0, < 26.0.2

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5hVendor Advisory
https://github.com/nextcloud/server/pull/38265Issue Tracking
https://hackerone.com/reports/1978882Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5hVendor Advisory
https://github.com/nextcloud/server/pull/38265Issue Tracking
https://hackerone.com/reports/1978882Third Party Advisory

Timeline

Published: Jun 23, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-35928?

How severe is CVE-2023-35928?

CVE-2023-35928 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.98% probability of exploitation in the next 30 days.

How do I fix CVE-2023-35928?

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-2023-35928?

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

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Source: NVD / NIST