CVE-2026-40471

Critical severity, CVSS 9.6. EPSS: 0.2% chance of exploitation in the next 30 days.

hackage-server lacked Cross-Site Request Forgery (CSRF) protection across its endpoints. Scripts on foreign sites could trigger requests to hackage server, possibly abusing latent credentials to upload packages or perform other administrative actions. Some unauthenticated actions could also be abused (e.g. creating new user accounts).

Published 2026-04-23. Last modified 2026-06-17.