CVE-2021-41179
moderate-risk
Published 2021-10-25
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.
Do I need to act?
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0.51% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.5/10
Medium
NETWORK
/ LOW complexity
Affected Products (1)
Server
Affected Vendors
References (6)
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-r...
Permissions Required
https://hackerone.com/reports/1322865
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7hvh-r...
Permissions Required
https://hackerone.com/reports/1322865
31
/ 100
moderate-risk
Severity
24/34 · High
Exploitability
2/34 · Minimal
Exposure
5/34 · Minimal