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CVE-2026-33656

CriticalPublished

EspoCRM vulnerable to authenticated RCE via Formula with path traversal in attachment sourceId, exploitable by admin user

Published: Apr 22, 2026
Updated: Apr 23, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 41.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

ESPOCRM-RCE-POC-CVE-2026-33656Exploit
Authenticated RCE exploit for EspoCRM <= 9.3.3 (CVE-2026-33656) via Formula ACL bypass, path traversal, and .htaccess poisoning to achieve OS command execution.

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