CVE-2025-46345: Auth0 Account Link Extension JWT Invalid Signature Validation

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-01 · updated 2026-06-17
Weakness: CWE-290

Description

Auth0 Account Link Extension is an extension aimed to help link accounts easily. Versions 2.3.4 to 2.6.6 do not verify the signature of the provided JWT. This allows the user the ability to supply a forged token and the potential to access user information without proper authorization. This issue has been patched in versions 2.6.7, 2.7.0, and 3.0.0. It is recommended to upgrade to version 3.0.0 or greater.

Affected products

auth0-extensions auth0-account-link-extension: from 2.3.4, < 2.6.7

References

https://github.com/auth0-extensions/auth0-account-link-extension/pull/187
https://github.com/auth0-extensions/auth0-account-link-extension/security/advisories/GHSA-j2jh-rqff-7vmg

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