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.

The following products are affected by CVE-2026-33656 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33656.

URL	Resource
https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x