Risk Letters

Exploited vulnerability

CVE-2026-32255

TLP:CLEAR

kan kan Server-Side Request Forgery (SSRF)

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.).

Facts

  • Vendor: kan
  • Product: kan
  • EPSS (probability of exploitation within 30 days): 26.4 %
  • First known exploitation: 17 September 2026
  • First seen by Risk Letters: 17 September 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD