Description
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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-110628 ↗
- github.com/kanbn/kan ↗
- github.com/kanbn/kan/blob/v0.6.0/.env.example ↗
- github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts ↗
- github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 ↗
- github.com/kanbn/kan/pull/590 ↗
- github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg ↗
- hackmd.io/@leediay/HyIxU63ofg ↗
- www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.