Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity security flaw in symfony from auth0. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 56.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	auth0/symfony	5.9.0	GHSA-ffq7-hh2j-r24p

Affected products (as reported)

Vendor	Product	Versions
auth0	symfony	>= 5.0.0-BETA0, < 5.9.0

Weakness: CWE-598 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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