# CVE-2026-67678: RainyGao DocSys arbitrary file upload to code execution

Source: https://junglewise.ai/threats/cve-2026-67678-rainygao-docsys-arbitrary-file-upload-to-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-17. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-67678 · Severity: critical · CVSS 9.8 · Published 2026-08-17

DocSys is a document management system. The vulnerability allows authenticated users to upload arbitrary files (such as JSP web shells) to the server, leading to complete compromise of the system. An attacker can execute arbitrary code and take over the server.

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

## Quick answers

**Is CVE-2026-67678 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-67678 being exploited in the wild.

**How severe is CVE-2026-67678?** Critical severity, with a CVSS score of 9.8, published 17 August 2026.

**Which products and versions are affected?** RainyGao DocSys v2.02.80.

**Is there a fix for CVE-2026-67678?** 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-2026-67678 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-67678?** 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

The /uploadDoc.do endpoint in DocSys v2.02.80 contains insufficient file upload validation. When the 'usage' parameter is provided, the application checks admin permissions but performs no file type or content validation, allowing attackers to upload executable files (e.g., JSP shells) with attacker-controlled filenames. The vulnerability requires authentication but does not restrict file extensions or validate file content. Attackers can upload web shells to attain remote code execution and full server control. No patch status is indicated in available sources.

## Affected products

- RainyGao DocSys v2.02.80

## Timeline

- 2026-06-16: disclosed: Issue opened on GitHub
- 2026-08-17: advisory: CVE-2026-67678 published

## References

- [https://github.com/RainyGao-GitHub/DocSys/issues/49](https://github.com/RainyGao-GitHub/DocSys/issues/49)
- [https://github.com/Y4y17/CVE/blob/main/DocSys/%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E.md](https://github.com/Y4y17/CVE/blob/main/DocSys/%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E.md)

## 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)
- [DocSys unauthenticated arbitrary file download via downloadDocEx](https://junglewise.ai/threats/cve-2026-75413-docsys-unauthenticated-arbitrary-file-download-via-downloaddocex)