What’s Vulnerable › Vulnerabilities

CVE-2026-50157: Auth0 Symfony: Bearer Token Accepted via URL Query Parameter in Auth0 Symfony SDK

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-30
• Weakness: CWE-598

Description

Auth0 Symfony is a Symfony SDK for Auth0 Authentication and Management APIs. From 5.0.0-BETA0 until 5.9.0, the Authorizer::authenticate() and Authorizer::supports() paths in the Authorizer security authenticator may accept OAuth 2.0 bearer access tokens from the token URL query parameter as well as the Authorization header for protected HTTP routes. Query-string tokens can be recorded in server logs, browser history, or referrer data and then replayed against protected API endpoints. This issue is fixed in version 5.9.0.

Affected products

• auth0 symfony: from 5.0.0-BETA0, < 5.9.0

References

• https://github.com/auth0/symfony/commit/bd1851b14ae15e99cbe87c96496cf25da025288a
• https://github.com/auth0/symfony/releases/tag/5.9.0
• https://github.com/auth0/symfony/security/advisories/GHSA-ffq7-hh2j-r24p

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