What’s Vulnerable › Vulnerabilities

CVE-2020-8236

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-02 · updated 2026-06-17
• Weakness: CWE-287

Description

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.

Affected products

• Nextcloud Server: before 19.0.2 — fixed in 19.0.2

How to fix

Upgrade to a fixed version: Nextcloud Server 19.0.2. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/924393
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-037
• https://hackerone.com/reports/924393
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-037

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