High 8.6Published Mar 18, 2026

CVE-2026-32255Kan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint

Updated under an hour ago (Oct 26, 2026, 7:20 PM ET)

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It affects kanbn kan and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for kanbn kan

Exploited in the last 30 days

Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body. An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.).

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): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

kanbn kan kanbn:kan (from the name)	before 0.5.5	CNA record
kan kan kan:kan	before 0.5.5	NVD

References

References

https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7	x-refsource-misc, patch
https://github.com/kanbn/kan/releases/tag/v0.5.5	x-refsource-misc, product, release-notes

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.