CVE-2026-50157Network attack vector

Bearer token exposure via query parameter acceptance

Published Sep 14, 2026 · Updated Sep 14, 2026

Information exposure in Auth0 Symfony before 5.9.0 allows remote authenticated users to leak bearer tokens through URL query parameters. The Authorizer security authenticator's authenticate() and supports() paths accept access_token query values for protected routes instead of requiring the Authorization header. A valid bearer token must reach such a route; intermediary logs, browser history, or referrer data can retain the token for replay against protected API endpoints.

CVSS severity6.5
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Auth0 Symfony before 5.9.0 allows remote authenticated users to leak bearer tokens through URL query parameters. The Authorizer security authenticator's authenticate() and supports() paths accept access_token query values for protected routes instead of requiring the Authorization header. A valid bearer token must reach such a route; intermediary logs, browser history, or referrer data can retain the token for replay against protected API endpoints.

The record

CVE
CVE-2026-50157
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, CWE-598, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-598Use of GET Request Method With Sensitive Query Strings
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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