Arbitrary file upload in Nextcloud Contacts

CVE-2020-8181

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

EPSS: 0.008 (52.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Nextcloud Contacts
N/a Nextcloud Contact — versions 3.3.0

Weakness classification (CWE)

References

support@hackerone.com (x_refsource_MISC)
support@hackerone.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-8181?: CVE-2020-8181 is a medium-severity vulnerability in Nextcloud Contacts, classified under CWE-840. CVSS score: 4.3/10. Published 2020-07-10.
How severe is CVE-2020-8181?: Medium severity. CVSS v3 base score is 4.3 out of 10.