How severe is CVE-2025-64099?

CVE-2025-64099 has a CVSS 4.0 base score of 8.1, rated high severity.

Is CVE-2025-64099 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-64099?

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-2025-64099 have an EU (EUVD) identifier?

Yes. CVE-2025-64099 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-131956.

When was CVE-2025-64099 published?

CVE-2025-64099 was published on 2025-11-12 and last updated on 2026-06-17.

CVE-2025-64099

CVE-2025-64099 is a high-severity vulnerability with a CVSS 4.0 base score of 8.1. 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-74.

Key facts

Severity: High (CVSS 4.0 base score 8.1)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-131956
Weakness: CWE-74
Published: 2025-11-12
Last modified: 2026-06-17

Description

Open Access Management (OpenAM) is an access management solution. In versions prior to 16.0.0, if the "claims_parameter_supported" parameter is activated, it is possible, thanks to the "oidc-claims-extension.groovy" script, to inject the value of one's choice into a claim contained in the id_token or in the user_info. In the request of an authorize function, a claims parameter containing a JSON file can be injected. This JSON file allows attackers to customize the claims returned by the "id_token" and "user_info" files. This allows for a very wide range of vulnerabilities depending on how clients use claims. For example, if some clients rely on an email field to identify a user, an attacker can choose the email address they want, and therefore assume any identity they choose. Version 16.0.0 fixes the issue.

Frequently asked questions

What is CVE-2025-64099?: Open Access Management (OpenAM) is an access management solution. In versions prior to 16.0.0, if the "claims_parameter_supported" parameter is activated, it is possible, thanks to the "oidc-claims-extension.groovy" script, to inject the value of one's choice into a claim contained in the id_token or in the user_info. In the request of an authorize function, a claims parameter containing a JSON file can be injected. This JSON file allows attackers to customize the claims returned by the "id_token" and "user_info" files. This allows for a very wide range of vulnerabilities depending on how clients use claims. For example, if some clients rely on an email field to identify a user, an attacker can choose the email address they want, and therefore assume any identity they choose. Version 16.0.0 fixes the issue.
How severe is CVE-2025-64099?: CVE-2025-64099 has a CVSS 4.0 base score of 8.1, rated high severity.
Is CVE-2025-64099 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-64099?: 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-2025-64099 have an EU (EUVD) identifier?: Yes. CVE-2025-64099 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-131956.
When was CVE-2025-64099 published?: CVE-2025-64099 was published on 2025-11-12 and last updated on 2026-06-17.

References

https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-39hr-239p-fhqc

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