CVE-2023-28997 MEDIUM

CVE-2023-28997: Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files

Vendor Nextcloud
Product security-advisories
Weakness CWE-323
Published April 4, 2023
Last update November 3, 2025
View on NVD All CVEs

CVSS base score

6.7/10
Attack vector Physical
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 4, 2023 CVE published
November 3, 2025 Record updated