Read the docs
TI-2023-13459 Aliases CVE-2023-28998

Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys

Priority LOW 33CWE-325Published · Updated

Key facts

Attack vector
Physical
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00679 52nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed security-advisories (nextcloud): 3.6.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisories3.0.0 to before 3.6.53.6.5Patch availableCNA
  • security-advisories Vendornextcloud Affected 3.0.0 to before 3.6.5 Fixed in 3.6.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*3.0.0 to before 3.6.5Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:* Versions 3.0.0 to before 3.6.5 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 3.6.5

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-28998

References

Exploit 1

Patch 1

Advisory 1

  • TI-2022-18709 Cross-site scripting (XSS) in Nextcloud Desktop Client CVSS 3.1MEDIUM 6.1
  • TI-2022-18708 Cross-site scripting (XSS) in Nextcloud Desktop Client CVSS 3.1MEDIUM 5.4
  • TI-2022-18707 Cross-site Scripting (XSS) in Nexcloud Desktop Client CVSS 3.1MEDIUM 5.4
  • TI-2022-18710 nextcloudcmd incorrectly trusts bad TLS certificates CVSS 3.1MEDIUM 4.7
  • TI-2020-06645 Path traversal in Desktop Client CVSS 3.1MEDIUM 6.8
  • TI-2021-05740 Injection in Nextcloud Desktop Client CVSS 3.1HIGH 8.8
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences