Auth0 Symfony up to 5.8.x Authorizer security authenticator supports token authentication replay

Summaryinfo

A vulnerability identified as critical has been detected in Auth0 Symfony up to 5.8.x. The affected element is the function Authorizer::authenticate/Authorizer::supports of the component Authorizer security authenticator. Performing a manipulation of the argument token results in authentication replay. This vulnerability is cataloged as CVE-2026-50157. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Auth0 Symfony up to 5.8.x. It has been classified as critical. This affects the function Authorizer::authenticate/Authorizer::supports of the component Authorizer security authenticator. The manipulation of the argument token with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-50157 since 06/03/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1040 for this issue.

Upgrading to version 5.9.0 eliminates this vulnerability.

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Productinfo

Vendor

• Auth0

Name

• Symfony

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8

License

• open-source

Website

• Product: https://github.com/auth0/symfony/

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