Vulnerability Monitor

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CVE-2021-32726

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.1, indicating it can be exploited remotely over the network but requires specific conditions to be met though user interaction is required requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 1 product from nextcloud organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-07-12T20:15:10.037

Last Modified

2024-11-21T06:07:36.587

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.1 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Secondary
CWE-708
Type: Primary
CWE-287

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	nextcloud	nextcloud_server	< 19.0.13	Yes
Application	nextcloud	nextcloud_server	< 20.0.11	Yes
Application	nextcloud	nextcloud_server	< 21.0.3	Yes

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg Third Party Advisory ([email protected])
https://github.com/nextcloud/server/pull/27532 Third Party Advisory ([email protected])
https://hackerone.com/reports/1202590 Permissions Required ([email protected])
https://security.gentoo.org/glsa/202208-17 Third Party Advisory ([email protected])
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/nextcloud/server/pull/27532 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://hackerone.com/reports/1202590 Permissions Required (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202208-17 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For nextcloud's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.