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GHSA-9jg3-g3wh-w9pj

HighCVSS 7.5 / 10
Published Aug 28, 2026·Last modified Aug 28, 2026
Affected Components(1)
Maven logoorg.yamcs/yamcs-core
< 5.12.0
Description

Attack type: 

Unauthenticated remote 

Impact:

Attackers can access any system files from the underlying host.

Affected components: HttpRequestHandler.java, StaticFileHandler.java

An Unauthenticated Directory Traversal vulnerability exists in Yamcs <=5.8.6, allowing anyone to access any file on the underlying operating system. This allows unauthenticated attackers to download sensitive files and data.

<img width="2170" height="1289" alt="image" src="https://github.com/user-attachments/assets/8d426da1-5351-4240-a290-8d858be61312" />

Steps to Reproduce:

  1. Start Yamcs and login as a user
  2. Paste the following URL in the browser and press enter:
http://localhost:8090//etc/passwd
  1. The /etc/passwd file will be downloaded.

Acknowledgements

This vulnerability was discovered by Abderrahim Dahmani while solving a STARPWN 2025 CTF challenge at DEFCON 33 offered by VisionSpace Technologies.

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Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
1.72%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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