---
id: CVE-2026-110628
title: >-
  Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request
  forgery vulnerability in the /api/download/attatchment route due to an
  incomplete fix for CVE-2026-32255
summary: >-
  Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request
  forgery vulnerability in the /api/download/attatchment route due to an
  incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can
  pass arbitrary url…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-918
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T15:17:15.653'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110628'
references:
  - url: 'https://github.com/kanbn/kan'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7
    label: disclosure@vulncheck.com
  - url: 'https://github.com/kanbn/kan/pull/590'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg'
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@leediay/HyIxU63ofg'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:14.010Z'
---

## Overview

Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.