CVE-2026-33656
EspoCRM vulnerable to authenticated RCE via Formula with path traversal in attachment `sourceId`, exploitable by admin user
CRITICAL 9.1EPSS 0.6%
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.
- Affected
- espocrm
- CVSS v3.1 GITHUB
- 9.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.60% chance of exploitation in the next 30 days, 48th percentile
- Published
- 2026-04-22
- Updated
- 2026-04-23
Proof-of-concept exploits (1)
- JivaSecurity/ESPOCRM-RCE-POC-CVE-2026-336560★ · 2026-03-25