What is CVE-2020-37071?

CVE-2020-37071 is a critical-severity vulnerability in Craftcms, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-02-03.

How severe is CVE-2020-37071?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Craftcms

CVE-2020-37071

CraftCMS 3 vCard Plugin 1.0.0 contains a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary PHP code through a crafted payload. Attackers can generate a malicious serialized payload that triggers remote code execution by exploiting the plugin's vCard download functionality with a specially crafted request.

Vulnerability class: Insecure Deserialization

EPSS: 0.006 (45.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Craftcms — versions 1.0.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

ExploitDB-48492 (exploit)
Official CraftCMS Vendor Homepage (product)
CraftCMS vCard Plugin Page (product)
Researcher Exploit Disclosure (technical-description, exploit)
VulnCheck Advisory: CraftCMS 3 vCard Plugin 1.0.0 - Remote Code Execution (third-party-advisory)

Frequently asked questions

What is CVE-2020-37071?: CVE-2020-37071 is a critical-severity vulnerability in Craftcms, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-02-03.
How severe is CVE-2020-37071?: Critical severity. CVSS v3 base score is 9.8 out of 10.