Webauthn tokens not removed after user has been deleted
Priority MEDIUM 46CWE-708Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.
Summary
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, webauthn tokens were not deleted after a user has been deleted. If a victim reused an earlier used username, the previous user could gain access to their account. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
Why it matters now
EPSS 0.01779 78th percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 19.0.13, 20.0.11, 21.0.3
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 19.0.13; 20.0.0 to before 20.0.11; 21.0.0 to before 21.0.3 | 19.0.13, 20.0.11, 21.0.3 | Patch available | CNA |
- security-advisories Vendornextcloud Affected before 19.0.13; 20.0.0 to before 20.0.11; 21.0.0 to before 21.0.3 Fixed in 19.0.13, 20.0.11, 21.0.3 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | before 19.0.13; 20.0.0 to before 20.0.11; 21.0.0 to before 21.0.3 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 19.0.13; 20.0.0 to before 20.0.11; 21.0.0 to before 21.0.3 Vulnerable ·nextcloud
Remediation
- Fix · CNA security-advisories (nextcloud) Fixed in 19.0.13, 20.0.11, 21.0.3
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2021-32726
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-2021-32726 · CVE Program
- CVE-2021-32726 · NVD
- FIRST EPSS
- CVE-2021-32726 · 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