Authorization bypass through user-controlled key in EspoCRM - CVE-2026-33740
Published: April 14, 2026
Vulnerability identifier: #VU125916
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33740
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: EspoCRM
Affected software:
EspoCRM
EspoCRM
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information and delete another user's attachment record.
The vulnerability exists due to improper access control in the POST /api/v1/Email/importEml endpoint and ImportEmlService attachment lookup when processing an attacker-controlled fileId. A remote user can supply a raw fileId referencing another user's .eml attachment to disclose sensitive information and delete another user's attachment record.
Exploitation requires Email:create and Import permissions, and the attacker must know or obtain the target attachment ID.
How to mitigate CVE-2026-33740
Install security update from vendor's website.