Unrated severityNVD Advisory· Published Apr 4, 2023· Updated Nov 3, 2025
Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files
CVE-2023-28997
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.
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Affected products
2- Range: >=3.0.0, <3.6.5
- nextcloud/security-advisoriesv5Range: >= 3.0.0, < 3.6.5
Patches
Vulnerability mechanics
References
3- ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdfmitrex_refsource_MISC
- github.com/nextcloud/desktop/pull/5324mitrex_refsource_MISC
- github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fcmitrex_refsource_CONFIRM
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