Unauthorized user information access via unverified JWT
Published May 1, 2025 · Updated May 2, 2025
Authentication bypass in Auth0 Account Link Extension 2.3.4 through 2.6.6 allows remote attackers to access user information with a forged JWT. The /index account-linking route accepts supplied token claims without verifying the JWT signature before using them to link accounts. No authentication or user interaction is required, and the documented consequence is unauthorized access to user information rather than data modification or service interruption.
Summary
What happened
Authentication bypass in Auth0 Account Link Extension 2.3.4 through 2.6.6 allows remote attackers to access user information with a forged JWT. The /index account-linking route accepts supplied token claims without verifying the JWT signature before using them to link accounts. No authentication or user interaction is required, and the documented consequence is unauthorized access to user information rather than data modification or service interruption.
The record
- CVE
- CVE-2025-46345
- Published
- May 1, 2025
- Updated
- May 2, 2025
- Vendor
- Auth0
- Product
- Auth0 Account Link Extension
- Classifications
- CWE-290
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 1, 2025CVE publishedPublication date reported by the CVE source.
- May 2, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.3.4, < 2.6.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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