Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Desktop | >= 3.0.0, < 3.6.5 |
Related Weaknesses (CWE)
References
- https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcryptoExploitTechnical DescriptionThird Party Advisory
- https://github.com/nextcloud/desktop/pull/5324Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rVendor Advisory
- https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcryptoExploitTechnical DescriptionThird Party Advisory
- https://github.com/nextcloud/desktop/pull/5324Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rVendor Advisory
- https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html
FAQ
What is CVE-2023-28997?
CVE-2023-28997 is a vulnerability with a CVSS score of 6.7 (MEDIUM). 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 c...
How severe is CVE-2023-28997?
CVE-2023-28997 has been rated MEDIUM with a CVSS base score of 6.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-28997?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Desktop.