# CVE-2026-75413: DocSys unauthenticated arbitrary file download via downloadDocEx

Source: https://junglewise.ai/threats/cve-2026-75413-docsys-unauthenticated-arbitrary-file-download-via-downloaddocex  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-26. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-75413 · Severity: high · CVSS 7.5 · Published 2026-08-26

DocSys is a document management system. The application contains an unauthenticated file download vulnerability in the downloadDocEx endpoint that allows attackers to read and download any file from the server by manipulating path parameters. This could expose sensitive data including configuration files, credentials, and other business-critical documents without requiring login.

Technologies: [RainyGao DocSys](https://junglewise.ai/threats/technologies/docsys). Vendors: [RainyGao](https://junglewise.ai/threats/vendors/rainygao).

## Quick answers

**Is CVE-2026-75413 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75413 being exploited in the wild.

**How severe is CVE-2026-75413?** High severity, with a CVSS score of 7.5, published 26 August 2026.

**Which products and versions are affected?** RainyGao DocSys 2.02.80.

**Is there a fix for CVE-2026-75413?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-75413 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-75413?** Check whether you run RainyGao DocSys at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

DocSys V2.02.80 is vulnerable to arbitrary file download through the downloadDocEx.do interface. The vulnerability exists in DocController.java where the application accepts targetPath and targetName parameters without proper validation or access control. The parameters are base64-decoded and directly concatenated to construct a file path, with no filtering or directory traversal protection. An attacker can craft a request with base64-encoded path traversal sequences to download any file readable by the application process. The vulnerability requires only knowledge of the target file path and does not require authentication.

## Affected products

- RainyGao DocSys 2.02.80

## Timeline

- 2026-06-15: disclosed: Vulnerability reported on GitHub
- 2026-08-26: advisory: CVE-2026-75413 published

## References

- [https://github.com/RainyGao-GitHub/DocSys/issues/48](https://github.com/RainyGao-GitHub/DocSys/issues/48)

## Related threats

- [RainyGao DocSys SQL injection in database reset](https://junglewise.ai/threats/cve-2026-105158-a-vulnerability-was-detected-in-rainygao-docsys-up-to-2-02-85)
- [RainyGao DocSys path traversal in document controller](https://junglewise.ai/threats/cve-2026-105157-a-security-vulnerability-has-been-detected-in-rainygao-docsys-up)
- [RainyGao DocSys arbitrary file upload to code execution](https://junglewise.ai/threats/cve-2026-67678-rainygao-docsys-arbitrary-file-upload-to-code-execution)