Vulnerability in Nextcloud Security-Advisories
CVE-2021-41179
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.
EPSS: 0.012 (66.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Nextcloud Security-advisories — versions < 20.0.13, >= 21.0.0, < 21.0.5, < 22.2.0
- Nextcloud Server
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Permissions Required, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-41179?
- CVE-2021-41179 is a medium-severity vulnerability in Nextcloud Security-Advisories, classified under Missing Critical Step in Authentication. CVSS score: 6.5/10. Published 2021-10-25.
- How severe is CVE-2021-41179?
- Medium severity. CVSS v3 base score is 6.5 out of 10.