Medium severity · published Apr 4, 2023
CVE-2023-28997
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server
6.5
CVSS
1.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DE
Desktop · Nextcloud
3.0.0 before 3.6.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-28997
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-28997
Exploit
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
Patch
https://github.com/nextcloud/desktop/pull/5324
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc
lists.debian.org
https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html
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