Description
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.).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| kanbn | kan | < 0.5.5 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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kOaDT/poc-cve-2026-32255 ★ 2 · Mar 19, 2026
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.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- Kan <= 0.5.4 - Server-Side Request Forgery http/cves/2026/CVE-2026-32255.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.