CVE-2026-31271

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

megagao production_ssm v1.0 contains an authorization bypass vulnerability in the user addition functionality. The insert() method in UserController.java lacks authentication checks, allowing unauthenticated attackers to create super administrator accounts by directly accessing the /user/insert endpoint. This leads to complete system compromise.

Published 2026-04-07. Last modified 2026-06-17.