High 8.6Published Oct 14, 2026

CVE-2026-110628Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment

Updated under an hour ago (2026-10-19 11:10 UTC)

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It affects kanbn kan. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.43%, higher than 35% of scored CVEs.

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Exploited in the last 30 days

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: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.43% (percentile 35)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

kanbn kan kanbn:kan (from the name)	from 0.5.5 through 0.6.0	CNA record

References

https://hackmd.io/@leediay/HyIxU63ofgthird-party-advisory
https://github.com/kanbn/kan/pull/590issue-tracking, patch
https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52technical-description
https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27technical-description
https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqgvendor-advisory
https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7patch
https://github.com/kanbn/kanproduct
https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchmentthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.