by Kastro
Paper/Archive/CVE-2021-32726

CVE-2021-32726

nextcloud security-advisories — Webauthn tokens not removed after user has been deleted

EPSS 2%CVSS 9.8
critical.is priorityof 100
45
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 78.2.782 × 2015.6No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
security-advisories< 19.0.13–CNA
security-advisories>= 20.0.0, < 20.0.11–CNA
security-advisories>= 21.0.0, < 21.0.3–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)7.1CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

References

refgithub.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mgrefgithub.com/nextcloud/server/pull/27532refhackerone.com/reports/1202590advisorysecurity.gentoo.org/glsa/202208-17