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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
kanbn kan
Default version status: unaffected
0.5.5 to ≤ 0.6.0affected
pkg:github/kanbn/kanReferences
- https://hackmd.io/@leediay/HyIxU63ofg ↗
- https://github.com/kanbn/kan/pull/590 ↗
- https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52 ↗
- https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27 ↗
- https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg ↗
- https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 ↗
- https://github.com/kanbn/kan ↗
- https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment ↗