# CVE-2026-75327: DocSys uploadMarkdownPic arbitrary file upload

Source: https://junglewise.ai/threats/cve-2026-75327-docsys-uploadmarkdownpic-arbitrary-file-upload  
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-2026-75327 · Severity: critical · CVSS 9.8 · Published 2026-08-26

DocSys is a document management system. Its image upload interface allows unauthenticated attackers to upload arbitrary files to any location on the server through path traversal, enabling code execution and potential server compromise.

## Quick answers

**Is CVE-2026-75327 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75327 being exploited in the wild.

**How severe is CVE-2026-75327?** Critical severity, with a CVSS score of 9.8, published 26 August 2026.

**Which products and versions are affected?** DocSys DocSys V2.02.85.

**Is there a fix for CVE-2026-75327?** 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-2026-75327 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-75327?** Check whether anything you run is named in the advisory. 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 uploadMarkdownPic endpoint in DocController.java (lines 2019-2024) accepts user-supplied imgName and file parameters without validation. The imgName parameter is directly used as a filename (lines 2081-2088) and combined with a path without sanitization, allowing directory traversal sequences (e.g., ../../../../../../../../tmp/). No authentication is required. An attacker can upload arbitrary files with controlled names to arbitrary filesystem locations, such as web-accessible directories, leading to remote code execution. The vulnerability affects DocSys-master V2.02.85 and potentially later versions.

## Affected products

- DocSys DocSys V2.02.85

## Timeline

- 2026-08-26: disclosed

## References

- [https://github.com/fangtang7/CVE/blob/main/DocSys/DocSys%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0.md](https://github.com/fangtang7/CVE/blob/main/DocSys/DocSys%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0.md)