How severe is CVE-2025-48951?

CVE-2025-48951 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2025-48951 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-48951?

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

Does CVE-2025-48951 have an EU (EUVD) identifier?

Yes. CVE-2025-48951 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16787.

When was CVE-2025-48951 published?

CVE-2025-48951 was published on 2025-06-03 and last updated on 2026-06-17.

CVE-2025-48951

CVE-2025-48951 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-502.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16787
Weakness: CWE-502
Published: 2025-06-03
Last modified: 2026-06-17

Description

Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.

Frequently asked questions

What is CVE-2025-48951?: Auth0-PHP is a PHP SDK for Auth0 Authentication and Management APIs. Versions 8.0.0-BETA3 prior to 8.3.1 contain a vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data. Applications using the Auth0-PHP SDK are affected, as are applications using the Auth0/symfony, Auth0/laravel-auth0, or Auth0/wordpress SDKs, because those SDKsrely on the Auth0-PHP SDK versions from 8.0.0-BETA3 until 8.14.0. Version 8.3.1 contains a patch for the issue.
How severe is CVE-2025-48951?: CVE-2025-48951 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2025-48951 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-48951?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-48951 have an EU (EUVD) identifier?: Yes. CVE-2025-48951 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16787.
When was CVE-2025-48951 published?: CVE-2025-48951 was published on 2025-06-03 and last updated on 2026-06-17.

References

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