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Vulnerability record · CVE-2025-55796 · published 18 November 2025

CVE-2025-55796: Openml.org uncontrolled resource consumption vulnerability

Openml · Openml.Org

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.

7.5 CVSS 3.1 High EPSS 0.59% · top 53.9% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/openml Product
https://github.com/openml/openml.org Product
https://github.com/openml/openml.org/security/advisories/GHSA-xfjh-gf9p-8qr6 ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-55796), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.