How severe is CVE-2025-55796?

CVE-2025-55796 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-55796 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-55796?

CVE-2025-55796 affects Openml Openml.org. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-55796?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-55796 have an EU (EUVD) identifier?

Yes. CVE-2025-55796 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198034.

When was CVE-2025-55796 published?

CVE-2025-55796 was published on 2025-11-18 and last updated on 2026-06-17.

CVE-2025-55796

CVE-2025-55796 is a high-severity vulnerability in Openml Openml.org with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198034
Weakness: CWE-400
Affected product: Openml Openml.org
Published: 2025-11-18
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-55796?: CVE-2025-55796 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-55796 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-55796?: CVE-2025-55796 affects Openml Openml.org. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-55796?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-55796 have an EU (EUVD) identifier?: Yes. CVE-2025-55796 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198034.
When was CVE-2025-55796 published?: CVE-2025-55796 was published on 2025-11-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openml:openml.org:*:*:*:*:*:*:*:*

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