CVE-2026-110628
Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment
- State
- Published
- Severity
- 9.2 Critical
- Published
- Oct 14, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N | VulnCheck |
| 3.1 | 8.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
kankanbn |
|
References
- https://hackmd.io/@leediay/HyIxU63ofgthird-party-advisory
- Open PR describing the S3_ENDPOINT-unset bypassissue-trackingpatch
- allowlist conditional on S3_ENDPOINT, unconditional fetch(url)technical-description
- S3_ENDPOINT documented as blank for AWS S3technical-description
- GitHub Security Advisory (GHSA-qrx8-9hc6-jvqg)vendor-advisory
- Incomplete fix for CVE-2026-32255patch
- https://github.com/kanbn/kanproduct
- VulnCheck Advisory: Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchmentthird-party-advisory
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