CVE-2021-41233 Missing authorization in Nextcloud text

Medium 6.5 Published 10 Mar 2022 Updated 23 Apr 2025

An attacker with a sharing link can access folder names in the Nextcloud Text application, exposing sensitive directory information.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-41233?

CVE-2021-41233 is a medium-severity missing authorization vulnerability in Nextcloud Nextcloud Server, published on 10 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Nextcloud text is a collaborative document editing using Markdown built for the nextcloud server. Due to an issue with the Nextcloud Text application, which is by default shipped with Nextcloud Server, an attacker is able to access the folder names of "File Drop". For successful exploitation an attacker requires knowledge of the sharing link. It is recommended that users upgrade their Nextcloud Server to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the Nextcloud Text application in the application settings.

Weakness: CWE-863, CWE-862

Which versions are affected by CVE-2021-41233?

It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2021-41233?

No fix has been published for CVE-2021-41233 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-2021-41233 being exploited?

There is no known exploitation of CVE-2021-41233 in the wild and no public exploit code.

All Nextcloud Nextcloud Server vulnerabilities

Sources

Also known as GHSA-26c8-35cm-xq9m.