Auth bypass in Nextcloud Server
CVE-2020-8236
A wrong configuration in Nextcloud Server 19.0.1 incorrectly made the user feel the passwordless WebAuthn is also a two factor verification by asking for the PIN of the passwordless WebAuthn but not verifying it.
Vulnerability class: Broken Authentication
EPSS: 0.006 (44.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Nextcloud Nextcloud_server
- N/a Nextcloud Server — versions 19.0.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support@hackerone.com (Exploit, Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (x_refsource_MISC, Broken Link, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-8236?
- CVE-2020-8236 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Authentication. CVSS score: 6.8/10. Published 2020-11-02.
- How severe is CVE-2020-8236?
- Medium severity. CVSS v3 base score is 6.8 out of 10.
- Is CVE-2020-8236 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.