CVE-2026-110628

CVSS 9.2 (critical) · published 2026-10-14

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.

Weakness: CWE-918

Source: NVD CVE-2026-110628

References

• https://github.com/kanbn/kan
• https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27
• https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52
• https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7
• https://github.com/kanbn/kan/pull/590
• https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg
• https://hackmd.io/@leediay/HyIxU63ofg
• https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment

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