CVE-2026-33656

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.