CVE-2023-28999CWE-325

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

Medium · published April 4, 2023

CVSS v3.1
6.9
EPSS
1%
Percentile
51.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.9 · MEDIUM
Vector
CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00678 · 51.7th percentile
Weakness
CWE-325 · Missing Cryptographic Step
Published
2023-04-04T12:51Z
EPSS history
Timeline
  • 04 APR 12:51Z
    Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
    cvelistv5