CVE-2023-54403: Yonyou u8 CRM

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Yonyou U8 CRM before V16.5 and V18 contains an arbitrary file read vulnerability in /ajax/getemaildata.php that allows unauthenticated attackers to bypass authentication using the DontCheckLogin=1 parameter and read arbitrary files via an unvalidated filePath parameter. Attackers can exploit this flaw to read sensitive files outside the web application directory, including configuration files containing database or service credentials. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-14.

Affected products

• Yonyou u8 CRM: version 16.1 only; version 16.0 only; version 15.1 only; version 13 only

Published 2026-09-30. Last modified 2026-10-02.