CVEs / CVE-2026-32255
CVE-2026-32255: kanbn kan vulnerability
- high 8.6 CVSS 3.1 (from the CNA)
- EPSS 26.3% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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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.).
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| kanbn kan | < 0.5.5 | — |
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.
Severity
| CVSS 3.1 | 8.6 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:NScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-918 |
References
- CVE-2026-32255 on NVD
- CVE-2026-32255 on OSV
- https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 Patch
- https://github.com/kanbn/kan/releases/tag/v0.5.5 Product, Release Notes
- https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg Mitigation, Patch, Vendor Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.