CVE-2025-55796: openml.org DoS — Exploit & Fix

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.

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
openml	openml.org	< 2.0.20241110

References

Advisories & Patches

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

Exploits

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

Other References

https://github.com/openml https://github.com/openml/openml.org

Frequently Asked Questions

What is CVE-2025-55796? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-55796? +

CVE-2025-55796 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-55796? +

CVE-2025-55796 affects products from openml, specifically: openml.org. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55796? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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