What’s Vulnerable › Vulnerabilities

CVE-2020-8281

• Severity: medium (CVSS 5.4 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: 2021-01-06 · updated 2026-06-17
• Weakness: CWE-79

Description

A missing file type check in Nextcloud Contacts 3.3.0 allows a malicious user to upload malicious SVG files to perform cross-site scripting (XSS) attacks.

Affected products

• Nextcloud Contacts: before 3.4.0 — fixed in 3.4.0

How to fix

Upgrade to a fixed version: Nextcloud Contacts 3.4.0. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/894876
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-045
• https://hackerone.com/reports/894876
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-045

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