CVE-2021-32726

Q: How do I fix CVE-2021-32726?

Upgrade nextcloud server to 21.0.3 or later.

Q: Is CVE-2021-32726 being actively exploited?

Not that we know of. CVE-2021-32726 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 77% of all scored CVEs.

Q: How severe is CVE-2021-32726?

CVE-2021-32726 has a CVSS v3 base score of 7.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-32726 affect?

Published advisories record a fix for nextcloud server (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGHEPSS 77th pctl

7.1

CVSS v3

NVD

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.

CWE-708 CWE-287Improper Authentication

How to fix

Remediation Available

nextcloud serverNVD

Affected:>= 21.0.0, < 21.0.3Fixed in:21.0.3CVE-2021-32726derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.78%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Third-Party Advisory3

Other references1

hackerone.com

Related Vulnerabilities

Other CWE-708 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-32689	High	8.1	1.0%	-	Fix
CVE-2022-33737	High	7.5	0.8%	-	Fix
CVE-2023-4008	Medium	5.3	0.7%	-	Fix
CVE-2024-9633	Low	3.1	0.5%	-	Fix
CVE-2023-41881	Low	3.7	0.3%	-	Fix
CVE-2024-45426	Medium	4.9	0.3%	-	Fix

Common questions

How do I fix CVE-2021-32726?

Upgrade nextcloud server to 21.0.3 or later.

Is CVE-2021-32726 being actively exploited?

Not that we know of. CVE-2021-32726 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 77% of all scored CVEs.

How severe is CVE-2021-32726?

CVE-2021-32726 has a CVSS v3 base score of 7.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-32726 affect?

Published advisories record a fix for nextcloud server (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-32726

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.