CVE-2026-33656
CRITICALEspoCRM vulnerable to authenticated RCE via Formula with path traversal in attachment `sourceId`, exploitable by admin user
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-33656. PoCs published by JivaSecurity.
AI-analyzed exploit summary This repository contains a functional exploit PoC for CVE-2026-33656, demonstrating an authenticated RCE in EspoCRM <= 9.3.3 via formula ACL bypass, path traversal, and .htaccess poisoning. The script automates the creation of a PHP webshell and execution of arbitrary commands.
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.
Exploits (1)
This repository contains a functional exploit PoC for CVE-2026-33656, demonstrating an authenticated RCE in EspoCRM <= 9.3.3 via formula ACL bypass, path traversal, and .htaccess poisoning. The script automates the creation of a PHP webshell and execution of arbitrary commands.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H