Home/CVE/Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, web
CVE

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, web

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.

HIGH · CVSS 7.1 EPSS 0.0055
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-287Improper Authentication
CWE-708Incorrect Ownership Assignment
▤

Affected Products & Versions

3
nextcloud server< 19.0.13
nextcloud server>= 20.0.0 and < 20.0.11
nextcloud server>= 21.0.0 and < 21.0.3
▣

Scoring & Timeline

7.1
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Jul 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

1
suse-csafopenSUSE-SU-2021:1068-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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