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CVE-2023-28998

Date: April 4, 2023

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.

Language: C++

Severity Score

Related Resources (6)

https://security-tracker.debian.org/tracker/CVE-2023-28998
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jh3g-wpwv-cqgr
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
https://nvd.nist.gov/vuln/detail/CVE-2023-28998
https://github.com/nextcloud/desktop/pull/5323
https://www.mend.io/vulnerability-database/CVE-2023-28998

Severity Score

Weakness Type (CWE)

Missing Cryptographic Step

CWE-325

CVSS v3.1

Base Score:
Attack Vector (AV): PHYSICAL
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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