Bypass of Two Factor Authentication in Nextcloud server
Priority LOW 39CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-306.
Summary
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.
Why it matters now
EPSS 0.01798 78th percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 20.0.12, 21.0.4, 22.1.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| nextcloud | security-advisories | before 20.0.12; 21.0.0 to before 21.0.4; 22.0.0 to before 22.1.0 | 20.0.12, 21.0.4, 22.1.0 | Patch available | CNA |
- security-advisories Vendornextcloud Affected before 20.0.12; 21.0.0 to before 21.0.4; 22.0.0 to before 22.1.0 Fixed in 20.0.12, 21.0.4, 22.1.0 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | before 20.0.12; 21.0.0 to before 21.0.4; 22.0.0 to before 22.1.0 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 20.0.12; 21.0.0 to before 21.0.4; 22.0.0 to before 22.1.0 Vulnerable ·nextcloud
Remediation
- Fix · CNA security-advisories (nextcloud) Fixed in 20.0.12, 21.0.4, 22.1.0
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-32800
References
More Nextcloud Server vulnerabilities
- TI-2023-20855 Users can delete external storage mount points CVSS 3.1HIGH 7.7
- TI-2023-11091 Nextcloud download permissions can be changed by resharer CVSS 3.1HIGH 7.5
- TI-2023-10624 Nextcloud Server vulnerable to SSRF via filter bypass due to lax checking on IPs CVSS 3.1MEDIUM 5.3
- TI-2025-37238 Cross-site scripting in Nextcloud CVSS 3.1MEDIUM 6.4
- TI-2023-11086 nextcloud vulnerable to Uncontrolled Resource Consumption CVSS 3.1MEDIUM 6.5
- TI-2022-18738 Exception logging in Sharepoint app reveals clear-text connection details CVSS 3.1MEDIUM 6.5
Sources
- CVE-2021-32800 · CVE Program
- CVE-2021-32800 · NVD
- FIRST EPSS
- CVE-2021-32800 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences