CVE-2021-32726

Name: CVE-2021-32726
Creator: NVD / NIST
Published: 2021-07-12T20:15:10.037+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.78%

Last modified Jun 17, 2026

CVE-2021-32726 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.78% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.78%

75.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 19.0.13
Nextcloud	Nextcloud Server	>= 20.0.0, < 20.0.11
Nextcloud	Nextcloud Server	>= 21.0.0, < 21.0.3

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mgThird Party Advisory
https://github.com/nextcloud/server/pull/27532Third Party Advisory
https://hackerone.com/reports/1202590Permissions Required
https://security.gentoo.org/glsa/202208-17Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mgThird Party Advisory
https://github.com/nextcloud/server/pull/27532Third Party Advisory
https://hackerone.com/reports/1202590Permissions Required
https://security.gentoo.org/glsa/202208-17Third Party Advisory

Timeline

Published: Jul 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32726?

How severe is CVE-2021-32726?

CVE-2021-32726 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.78% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32726?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32726?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST