CVE-2025-55796: Openml Frontend

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

The openml/openml.org web application version v2.0.20241110 uses predictable MD5-based tokens for critical user workflows such as signup confirmation, password resets, email confirmation resends, and email change confirmation. These tokens are generated by hashing the current timestamp formatted as "%d %H:%M:%S" without incorporating any user-specific data or cryptographic randomness. This predictability allows remote attackers to brute-force valid tokens within a small time window, enabling unauthorized account confirmation, password resets, and email change approvals, potentially leading to account takeover.

Affected products

• Openml Openml Frontend: before 2.0.20251111 (fixed in 2.0.20251111)

Published 2025-11-18. Last modified 2026-09-29.