CVE-2026-33656
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
Product
Espocrm
PublishedApr 22, 2026
First seenApr 22, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- espocrm espocrm9.3.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| espocrm espocrm | v < 9.3.4 | 9.3.4 |
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