CVE-2026-33656

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.

Affected products

Espocrm

Espocrm

< 9.3.4

Fix

Available

CVSS 3.1

9.1 CRITICAL

EPSS

0.5% (41th percentile)

Weakness

CWE-22

NVD status

Analyzed

Published

2026-04-22