---
id: CVE-2023-54403
title: >-
  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 a…
summary: >-
  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 a…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: Yonyou
product: U8 CRM
affected:
  - u8_crm 16.1
  - u8_crm 16.0
  - u8_crm 15.1
  - u8_crm 13
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:16:52.150'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-54403'
references:
  - url: >-
      https://github.com/PeiQi0/PeiQi-WIKI-Book/blob/main/docs/wiki/oa/%E7%94%A8%E5%8F%8BOA/%E7%94%A8%E5%8F%8B%20U8%20CRM%E5%AE%A2%E6%88%B7%E5%85%B3%E7%B3%BB%E7%AE%A1%E7%90%86%E7%B3%BB%E7%BB%9F%20getemaildata.php%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E.md
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/yonyou/yonyou-u8-crm-lfi.yaml
    label: disclosure@vulncheck.com
  - url: 'https://security.yonyou.com/#/noticeInfo?id=624'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yonyou-u8-crm-arbitrary-file-read-via-getemaildata-php
    label: disclosure@vulncheck.com
  - url: 'https://www.yonyou.com/Global/'
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-30T21:25:07.818Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.