CVE-2021-41179— Two-Factor Authentication not enforced for pages marked as public
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I. Basic Information for CVE-2021-41179
Vulnerability Information
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Vulnerability Title
Two-Factor Authentication not enforced for pages marked as public
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证中关键步骤缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nextcloud 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 存在安全漏洞，该漏洞源于网络系统或产品的代码开发过程中存在设计或实现不当的问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nextcloud | security-advisories | < 20.0.13 | - |
II. Public POCs for CVE-2021-41179
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/nextcloud/server/pull/28725x_refsource_MISC
- https://hackerone.com/reports/1322865x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-41179
Same Patch Batch · nextcloud · 2021-10-25 · 8 CVEs total
| CVE-2021-41178 | 8.8 HIGH | File Traversal affecting SVG files on Nextcloud Server |
| CVE-2021-39225 | 8.1 HIGH | Missing permission check on Deck API |
| CVE-2021-41177 | 8.1 HIGH | Rate-limits not working on instances without configured memory cache backend |
| CVE-2021-39221 | 6.4 MEDIUM | XSS in Contacts |
| CVE-2021-39223 | 4.8 MEDIUM | File path disclosure of shared files in Richdocuments application |
| CVE-2021-39220 | 3.5 LOW | Bypass of image blocking in Nextcloud Mail |
| CVE-2021-39224 | 3.5 LOW | File path disclosure of shared files in OfficeOnline application |
IV. Related Vulnerabilities
Same product: security-advisories
- CVE-2026-28272
Kiteworks Email Protection Gateway has a Cross-site Scriptin - CVE-2026-28271
Kiteworks Core is vulnerable to Server-Side Request Forgery - CVE-2026-28270
Kiteworks Core has an Unrestricted Upload of File with Dange - CVE-2026-28269
Kiteworks Core has an OS Command Injection - CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public
Same vendor: nextcloud
- CVE-2026-44515
Nextcloud News: Authenticated blind SSRF via feed URL - CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public - CVE-2025-66556
Nextcloud talk allows participants to blindly delete poll dr - CVE-2025-66554
Nextcloud Contacts vulnerable to Stored XSS in contacts app - CVE-2025-66549
Nextcloud Desktop discloses information when attempting to l
V. Comments for CVE-2021-41179
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