CVE-2026-33656
EspoCRM vulnerable to authenticated RCE via Formula with path traversal in attachment `sourceId`, exploitable by admin user
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.
INFO
Published Date :
April 22, 2026, 9:17 p.m.
Last Modified :
April 27, 2026, 5:04 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update EspoCRM to version 9.3.4 or later.
- Review EspoCRM configuration for file path handling.
- Ensure file path inputs are sanitized.
Public PoC/Exploit Available at Github
CVE-2026-33656 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33656.
| URL | Resource |
|---|---|
| https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x | Exploit Vendor Advisory |
| https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33656 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33656
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33656 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33656 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:espocrm:espocrm:*:*:*:*:*:*:*:* versions up to (excluding) 9.3.4 Added Reference Type CISA-ADP: https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 23, 2026
Action Type Old Value New Value Added Reference https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x -
New CVE Received by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-22 Added Reference https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x