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CVE-2026-32255

HighPublished

Kan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint

Published: Mar 18, 2026
Updated: Mar 19, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 25, 2026

Primary CVSS

8.6/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS probability estimate

20.8%

Moderate · next 30 days

Percentile: 97.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body. An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.).

Sources

poc-cve-2026-32255Exploit
This repository contains a proof of concept (POC) for CVE-2026-32255, a high-severity Server-Side Request Forgery (SSRF) vulnerability in Kan, an open-source project management tool.

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