CVE-2026-110628 PUBLISHED

Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

Assigner: VulnCheck
Reserved: 14.10.2026 Published: 14.10.2026 Updated: 14.10.2026

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.

CVSS Vector: 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
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS Score: 8.6

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	kanbn
Product	kan
Versions	Default: unaffected affected from 0.5.5 to 0.6.0 (incl.)

CVE-2026-110628 PUBLISHED

Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

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Product Status

Credits

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Problem Types