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CVE-2023-28998 Details

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 gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure, and add new files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

CNA: [email protected]CVSS-B:6.7 MEDIUMVector:CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf	CVE	ExploitTechnical DescriptionThird Party Advisory
https://github.com/nextcloud/desktop/pull/5323	CVE	PatchVendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jh3g-wpwv-cqgr	CVE	Vendor Advisory
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf	[email protected]	ExploitTechnical DescriptionThird Party Advisory
https://github.com/nextcloud/desktop/pull/5323	[email protected]	PatchVendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jh3g-wpwv-cqgr	[email protected]	Vendor Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-325	Missing Cryptographic Step	[email protected]

Affected Products

Product	Versions
nextcloud desktop	>= 3.0.0, < 3.6.5
CPE cpe:2.3:a:nextcloud:desktop:::::::: Remediation No remediation found in references.

Change History

6 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Apr 10, 2023	Initial Analysis	[email protected]