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Vulnerability record · CVE-2026-32255 · published 19 March 2026

CVE-2026-32255: Kan server-side request forgery (ssrf) vulnerability

Kan · Kan

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.).

8.6 CVSS 3.1 High EPSS 1.7% · top 23.1% CWE-918 · Server-side request forgery (SSRF)
8.6CVSS 3.1 base score
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 Patch
https://github.com/kanbn/kan/releases/tag/v0.5.5 ProductRelease Notes
https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg MitigationPatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-32255), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.