CVE-2026-110628
Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-918 |
| Vendor | kanbn |
| Product | kan |
| Published | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
kanbn / kan
0.5.5 ≤ 0.6.0
References
hackmd.io: https://hackmd.io/@leediay/HyIxU63ofg github.com: https://github.com/kanbn/kan/pull/590 github.com: https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52 github.com: https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27 github.com: https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg github.com: https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 github.com: https://github.com/kanbn/kan vulncheck.com: https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment
Credits
leediay153 from Viettel Post