Threat database

Kan versions 0.5.5 through 0.6.0 contain an unauthenticated server-side request forgery (SSRF) vulnerability in the /api/download/attatchment route. This vulnerability arises from an incomplete fix for a previous issue (CVE-2026-32255). When the S3_ENDPOINT environment variable is unset, attackers can supply arbitrary URL query parameters to the fetch() function, enabling them to access internal services, localhost ports, and cloud instance metadata. The vulnerability has a critical severity with a CVSS 4.0 score of 9.2. A patch is available to address this issue.

A missing authorization vulnerability in kanbn's kan product up to version 0.6.0 allows unauthorized users to create boards via the GitHub project import endpoint. This occurs because the importProjects mutation does not properly validate board creation permissions, enabling guests to bypass the intended board:create permission checks.

CVE-2026-32255 is a high-severity Server-Side Request Forgery (SSRF) vulnerability affecting kanbn's open-source project management tool, kan, in versions prior to 0.5.5. The vulnerability exists in the /api/download/attatchment endpoint, which lacks authentication and URL validation, allowing unauthenticated attackers to supply arbitrary URLs that the server fetches and returns. This can be exploited to access internal services, cloud metadata endpoints, or private network resources, potentially exposing sensitive information. No user interaction or authentication is required, and the vulnerability has a CVSS score of 8.6. The issue is fixed in version 0.5.5, and as a mitigation, blocking or restricting access to the vulnerable endpoint at the reverse proxy level is recommended.