CVE-2021-41179

Two-Factor Authentication not enforced for pages marked as public

State: Published
Severity: 6.5 Medium
Published: Oct 25, 2021
Updated: Aug 4, 2024
Reserved: Sep 15, 2021

Description

Nextcloud is an open-source, self-hosted productivity platform. Prior to Nextcloud Server versions 20.0.13, 21.0.5, and 22.2.0, the Two-Factor Authentication wasn't enforced for pages marked as public. Any page marked as `@PublicPage` could thus be accessed with a valid user session that isn't authenticated. This particularly affects the Nextcloud Talk application, as this could be leveraged to gain access to any private chat channel without going through the Two-Factor flow. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-304 Missing Critical Step in Authentication

Affected Products

Product	Versions
security-advisoriesnextcloud	< 20.0.13Affected >= 21.0.0, < 21.0.5Affected < 22.2.0Affected

References

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