CVE-2020-37071Public exploitNetwork attack vector

Unauthenticated PHP code execution via vCard deserialization

Published Feb 3, 2026 · Updated Feb 3, 2026

Deserialization in Craft CMS 3 vCard Plugin 1.0.0 allows remote attackers to execute arbitrary PHP code through a crafted request. The unauthenticated vCard download action processes an encrypted serialized vcard value, letting a Guzzle FileCookieJar gadget write attacker-supplied PHP into the web root. An affected site must have version 1.0.0 installed and the download action reachable; successful exploitation creates a web shell that runs commands as the PHP process.

CVSS severity9.3
Critical
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Craft CMS 3 vCard Plugin 1.0.0 allows remote attackers to execute arbitrary PHP code through a crafted request. The unauthenticated vCard download action processes an encrypted serialized vcard value, letting a Guzzle FileCookieJar gadget write attacker-supplied PHP into the web root. An affected site must have version 1.0.0 installed and the download action reachable; successful exploitation creates a web shell that runs commands as the PHP process.

The record

CVE
CVE-2020-37071
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=1.0.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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