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CVE-2021-32726

Webauthn tokens not removed after user has been deleted

CRITICAL
9.8
CVSS Score
Published: July 12, 2021 at 07:45 PM UTC
Updated: June 17, 2026 at 03:53 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nextcloud/server· Nextcloudnextcloud-app
95%
v < 19.0.1320.0.0 ≤ v < 20.0.1121.0.0 ≤ v < 21.0.3
Affected range stops below 19.0.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.0.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/nextcloud/server/pull/27532
x_refsource_MISCPermissions Required
Source: [email protected]
https://hackerone.com/reports/1202590
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202208-17

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-708CWE-287

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