CVE-2023-28997

Summary

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.

Affected Software

Weaknesses

• CWE-323: CWE-323: Reusing a Nonce, Key Pair in Encryption

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc
• https://github.com/nextcloud/desktop/pull/5324
• https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
• https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc
• https://github.com/nextcloud/desktop/pull/5324
• https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf

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