Vulnerability · Published Jul 12, 2021 · Assigned by GitHub_M

CVE-2021-32726Webauthn tokens not removed after user has been deleted

High 7.1

In plain English

A high-severity security flaw in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 78% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)1.8%top 21.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 19.0.13>= 20.0.0, < 20.0.11>= 21.0.0, < 21.0.3

Weakness: CWE-708 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6qr9-c846-j8mg x_refsource_CONFIRM
https://github.com/nextcloud/server/pull/27532 x_refsource_MISC
https://hackerone.com/reports/1202590 x_refsource_MISC
GLSA-202208-17 vendor-advisory, x_refsource_GENTOO