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TI-2023-13460 Aliases CVE-2023-28999

Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders

Priority LOW 34CWE-325Published · Updated

Key facts

Attack vector
Physical
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-311.

Summary

Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, 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.​ This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00678 52nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed security-advisories (nextcloud): 3.8.0, 3.25.0, 4.8.0

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 3.8.0; 3.13.0 to before 3.25.0; 3.0.5 to before 4.8.03.8.0, 3.25.0, 4.8.0Patch availableCNA
  • security-advisories Vendornextcloud Affected 3.0.0 to before 3.8.0; 3.13.0 to before 3.25.0; 3.0.5 to before 4.8.0 Fixed in 3.8.0, 3.25.0, 4.8.0 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*3.0.0 to before 3.8.0Vulnerablenextcloud
cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:iphone_os:*:*:*3.0.5 to before 4.8.0Vulnerablenextcloud
cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:android:*:*:*3.13.0 to before 3.25.0Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:* Versions 3.0.0 to before 3.8.0 Vulnerable ·nextcloud
  • cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:iphone_os:*:*:* Versions 3.0.5 to before 4.8.0 Vulnerable ·nextcloud
  • cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:android:*:*:* Versions 3.13.0 to before 3.25.0 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 3.8.0, 3.25.0, 4.8.0

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-2023-28999

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