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Critical severity · published Jul 12, 2021
CVE-2021-32726
Nextcloud Server is a Nextcloud package that handles data storage
9.8
CVSS
1.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 19.0.13; 20.0.0 before 20.0.11; 21.0.0 before 21.0.3 · source: NVD
Affected product
NS
Nextcloud Server
Nextcloud
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32726
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32726
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg
Third Party Advisory
https://github.com/nextcloud/server/pull/27532
Permissions Required
https://hackerone.com/reports/1202590
Third Party Advisory
https://security.gentoo.org/glsa/202208-17
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