CVE-2023-28844 User without download rights can download older version of that file in nextcloud server

Medium 5.7 Published 31 Mar 2023 Updated 11 Feb 2025

Users lacking download permissions can access older file versions, leading to unauthorized data disclosure in Nextcloud server deployments.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-28844?

CVE-2023-28844 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 31 Mar 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Nextcloud server is an open source home cloud implementation. In affected versions users that should not be able to download a file can still download an older version and use that for uncontrolled distribution. This issue has been addressed in versions 24.0.10 and 25.0.4. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Weakness: CWE-284

Which versions are affected by CVE-2023-28844?

It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2023-28844?

No fix has been published for CVE-2023-28844 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2023-28844 being exploited?

There is no known exploitation of CVE-2023-28844 in the wild and no public exploit code.

All Nextcloud Nextcloud Server vulnerabilities

Sources

Also known as GHSA-w47p-f66h-h2vj.