Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck
CVE-2026-110628Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment
High 8.6
In plain English
A high-severity server-side request forgery in kan from kanbn. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.4%top 63.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
References
- https://hackmd.io/@leediay/HyIxU63ofg third-party-advisory
- Open PR describing the S3_ENDPOINT-unset bypass issue-tracking, patch
- allowlist conditional on S3_ENDPOINT, unconditional fetch(url) technical-description
- S3_ENDPOINT documented as blank for AWS S3 technical-description
- GitHub Security Advisory (GHSA-qrx8-9hc6-jvqg) vendor-advisory
- Incomplete fix for CVE-2026-32255 patch
- https://github.com/kanbn/kan product
- VulnCheck Advisory: Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment third-party-advisory