Paper/Archive/CVE-2026-33656

CVE-2026-33656

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

EPSS 0.5%public exploit CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 42.9.429 × 208.6 Exploit: SSVC poc+1010.0 SSVC exploitation: poc+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

espocrm< 9.3.4–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x