PT-2026-26167 · Kanbn · Kan

Published 2026-03-18 · Updated 2026-03-19 · CVE-2026-32255

NVD

CVSS v3.1

8.6

High

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

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.).

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-32255

Affected Products

Kan

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-32255 · Security Note
• https://github.com/kanbn/kan/releases/tag/v0.5.5 · Note
• https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 · Note
• https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg · Note