CVE-2026-32255: high-severity vulnerability in kanbn kan
Kan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint
Published · Updated
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83Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 8.6epss 26%
from disclosure to weapon7 days
Published on NVDMar 18
1st PoC+7d
VulnCheck+183d
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.).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products
kanbn · kanpublic PoCs found — 1
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