# CVE-2026-33656

> Vulnerability · severity: **CRITICAL** (CVSS 9.1).

## Description

EspoCRM is an open source customer relationship management application. Prior to version 9.3.4, EspoCRM's built-in formula scripting engine allowing updating attachment's sourceId thus allowing an authenticated admin to overwrite the `sourceId` field on `Attachment` entities. Because `sourceId` is concatenated directly into a file path with no sanitization in `EspoUploadDir::getFilePath()`, an attacker can redirect any file read or write operation to an arbitrary path within the web server's `open_basedir` scope. Version 9.3.4 fixes the issue.

## Key facts

- **CVE ID:** CVE-2026-33656
- **Published:** 2026-04-22
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.1
- **CWE codes:** CWE-22

## Affected products

- `espocrm:espocrm`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33656

## Citation

> AI Analytics. CVE-2026-33656. Retrieved 2026-06-26 from https://api.ai-analytics.org/cve/CVE-2026-33656. Derived from NIST NVD. Licensed CC0.

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