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GHSA-ff24-4prj-gpmj

HighCVSS 7.2 / 10
Published Apr 10, 2026·Last modified Apr 10, 2026
Affected Components(0)

No affected components available

Description

Summary

The /api/templates/fetch endpoint accepts a caller-supplied url parameter and performs a server-side HTTP GET request to that URL without authentication and without URL scheme or host validation. The server's response is returned directly to the caller. type. This constitutes an unauthenticated SSRF vulnerability affecting any publicly reachable Arcane instance.

Details

  • No allowlist or denylist of destination hosts/CIDRs
  • No requirement for the caller to be authenticated

Response handling produces four distinct outcomes observable by the caller:

  • Valid JSON targets return a fully reflected response body if the returned fields fit the expected internal struct
  • Non-JSON HTTP 200 responses produce an error leaking the first byte of the response ("Invalid JSON response: invalid character '<'...")
  • Non-200 responses leak the HTTP status code
  • TCP-level failures distinguish between closed ports ("connection refused") and filtered ones ("i/o timeout")

PoC

Send an unauthenticated GET request to /api/templates/fetch, passing the target URL as the url query parameter.

<img width="1041" height="375" alt="image" src="https://github.com/user-attachments/assets/f9fd475e-90b0-4dec-95e1-0af6263f5bb5" />

Impact

  • Unauthenticated port scanning of internal networks
  • Access to internal HTTP services not exposed to the public internet (service discovery endpoints, internal dashboards, Kubernetes API)
Risk Scores
Base Score
7.2

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 vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.

Threat Intelligence
6.6

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

EPSS
0.62%

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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High severity
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