CVE-2026-110628
8.6HighPublished 14 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Impact
- High impact on confidentiality
- Weakness
- CWE-918
Impact
Unauthenticated remote attackers can query internal networks, localhost services, and cloud instance metadata. They only need network access to the application endpoint.
Root cause
The /api/download/attatchment route forwards user-supplied URLs directly to fetch() when the S3_ENDPOINT environment variable is unset.
Affected systems
Kan 0.5.5 through 0.6.0
CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Fix & remediation
Upgrade to a fixed version beyond 0.6.0 (or apply commit 53397d8e81dc1494d94132848c1f0416f1152bd7). As an immediate mitigation, set the S3_ENDPOINT environment variable to a valid S3 endpoint or block external requests to the /api/download/attatchment path.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD 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
- 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