CVE-2023-28997

Name: CVE-2023-28997
Creator: NVD / NIST
Published: 2023-04-04T13:15:08.867+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.11%

Last modified Jun 17, 2026

CVE-2023-28997 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. EPSS estimates a 1.11% chance of exploitation in the next 30 days.

Description

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.11%

61.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-323

Affected Software

Vendor	Product	Versions
Nextcloud	Desktop	>= 3.0.0, < 3.6.5

References

https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdfExploit, Technical Description, Third Party Advisory
https://github.com/nextcloud/desktop/pull/5324Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fcVendor Advisory
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdfExploit, Technical Description, Third Party Advisory
https://github.com/nextcloud/desktop/pull/5324Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fcVendor Advisory
https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html

Timeline

Published: Apr 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-28997?

How severe is CVE-2023-28997?

CVE-2023-28997 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.

How do I fix CVE-2023-28997?

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-2023-28997?

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

Scan your code now

Source: NVD / NIST