CVE-2023-28999 describes a critical vulnerability in Nextcloud Desktop, Android, and iOS clients (versions 3.0.0-3.8.0, 3.13.0-3.25.0, and 3.0.5-4.8.0 respectively) where a malicious server administrator can fully compromise end-to-end encrypted folders, decrypting files, recovering folder structures, and adding new content. This vulnerability carries a CVSS score of 6.4 (MEDIUM), indicating a high impact on confidentiality and integrity, with low attack complexity, requiring high privileges on the server. There are no known workarounds, but fixes are available in Nextcloud Desktop 3.8.0, Android 3.25.0, and iOS 4.8.0. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 3.0.0, < 3.8.0CPE matchmatch criteria | cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:* | ||
>= 3.0.5, < 4.8.0CPE matchmatch criteria | cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:iphone_os:*:*:* | ||
>= 3.13.0, < 3.25.0CPE matchmatch criteria | cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:android:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
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