CVE-2023-28998 | BDVDB-2026-199209 Detail

nextcloudsecurity-advisories

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: physical.

Weaknesses#

CWE-325 Missing Cryptographic Step

References#

Exploit#

No public exploit known

History#

Version 12023-04-04Record published in the CVE List.
Version 22025-02-11Most recent update recorded in the CVE List.

Published

Published: 2023-04-04
Last modified: 2025-02-11

Vendor information

Vendor: nextcloud
Product: security-advisories

All nextcloud vulnerabilities

Score

6.7 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 52.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 3.0.0, < 3.6.5
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.7 Medium

CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

Metric breakdown
Attack Vector	Physical
Attack Complexity	Low
Privileges Required	High
User Interaction	Required
Scope	Changed
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).