What’s Vulnerable › Vulnerabilities

CVE-2021-41233: Missing authorization in Nextcloud text

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-10 · updated 2026-06-17
• Weakness: CWE-862

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.

Affected products

• Nextcloud Server: before 20.0.14; from 21.0.0 before 21.0.6; from 22.2.0 before 22.2.1 — fixed in 20.0.14, 21.0.6, 22.2.1

How to fix

Upgrade to a fixed version: Nextcloud Server 20.0.14, 21.0.6, 22.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-26c8-35cm-xq9m
• https://github.com/nextcloud/text/pull/1884
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-26c8-35cm-xq9m
• https://github.com/nextcloud/text/pull/1884

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