SSRF in Kan
CVE-2026-32255
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.).
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.017 (77.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.208 · newest: 0.017 · change: -0.190
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg (Patch, Mitigation, Vendor Advisory)
- github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7 (Patch)
- github.com/kanbn/kan/releases/tag/v0.5.5 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-32255?
- CVE-2026-32255 is a high-severity vulnerability in Kan, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-03-19.
- How severe is CVE-2026-32255?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2026-32255 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.