What’s Vulnerable › Vulnerabilities

CVE-2020-8181

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-10 · updated 2026-06-17
• Weakness: CWE-840

Description

A missing file type check in Nextcloud Contacts 3.2.0 allowed a malicious user to upload any file as avatars.

Affected products

• Nextcloud Contacts: before 3.3.0 — fixed in 3.3.0

How to fix

Upgrade to a fixed version: Nextcloud Contacts 3.3.0. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/808287%2C
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-024
• https://hackerone.com/reports/808287%2C
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-024

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