User impersonation via SAML attribute smuggling
Published May 6, 2025 · Updated May 7, 2025
Authentication bypass in Auth0 passport-wsfed-saml2 3.0.5 through 4.6.3 allows remote authenticated users to impersonate any user. The SAML parser extracts identity attributes from the response document rather than limiting them to the signature-validated assertion, so injected attributes can override trusted identity data. Exploitation requires a valid SAML Response signed by the configured identity provider and results in an authenticated session as the chosen user.
Summary
What happened
Authentication bypass in Auth0 passport-wsfed-saml2 3.0.5 through 4.6.3 allows remote authenticated users to impersonate any user. The SAML parser extracts identity attributes from the response document rather than limiting them to the signature-validated assertion, so injected attributes can override trusted identity data. Exploitation requires a valid SAML Response signed by the configured identity provider and results in an authenticated session as the chosen user.
The record
- CVE
- CVE-2025-46573
- Published
- May 6, 2025
- Updated
- May 7, 2025
- Vendor
- Auth0
- Product
- passport-wsfed-saml2
- Classifications
- CWE-287, T1606.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 6, 2025CVE publishedPublication date reported by the CVE source.
- May 7, 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=>= 3.0.5, < 4.6.4
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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