Path Traversal in Yonyou U8 Crm
CVE-2023-54403
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Yonyou U8 Crm — versions 13, 15.1, 16.0
Weakness classification (CWE)
References
- security.yonyou.com/ (vendor-advisory, patch)
- github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/yon… (technical-description)
- github.com/PeiQi0/PeiQi-WIKI-Book/blob/main/docs/wiki/oa/用友OA/用友 U8 CRM客户关系管理系统… (exploit)
- www.yonyou.com/Global/ (product)
- www.vulncheck.com/advisories/yonyou-u8-crm-arbitrary-file-read-via-getemaildata… (third-party-advisory)
Frequently asked questions
- What is CVE-2023-54403?
- CVE-2023-54403 is a high-severity vulnerability in Yonyou U8 Crm, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-09-30.
- How severe is CVE-2023-54403?
- High severity. CVSS v3 base score is 7.5 out of 10.