CVE-2026-33656

Name: CVE-2026-33656
Creator: NVD / NIST
Published: 2026-04-22T21:17:05.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2026-33656 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

0.50%

39.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Espocrm	Espocrm	< 9.3.4

References

https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54xExploit, Vendor Advisory
https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54xExploit, Vendor Advisory

Timeline

Published: Apr 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33656?

How severe is CVE-2026-33656?

CVE-2026-33656 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33656?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33656?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST