Vulnerability · Published Sep 30, 2026 · Assigned by VulnCheck

CVE-2023-54403Yonyou U8 CRM Arbitrary File Read via getemaildata.php

High 7.5

In plain English

A high-severity path traversal in U8 CRM from Yonyou. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 59.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
Yonyou	U8 CRM	16.116.015.113

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Vendor Advisory vendor-advisory, patch
Nuclei Template technical-description
GitHub Exploit exploit
Vendor Homepage product
https://www.vulncheck.com/advisories/yonyou-u8-crm-arbitrary-file-read-via-getemaildata-php third-party-advisory