Auth0 Symfony SDK Vulnerable to Brute Force Authentication Tags of CookieStore Sessions
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- Security bypass
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-287.
Summary
**Overview** Session cookies of applications using the Auth0 symfony SDK configured with CookieStore have authentication tags that can be brute forced, which may result in unauthorized access. **Am I Affected?** You are affected by this vulnerability if you meet the following pre-conditions: 1. Applications using the Auth0 symfony SDK with version <=5.3.1 2. Auth0/Symfony SDK uses the Auth0-PHP SDK with version 8.0.0-BETA1 or higher and below 8.14.0. 3. Session storage configured with CookieStore. **Fix** Upgrade Auth0/symfony to v5.4.0. As an additional precautionary measure, we recommend rotating your cookie encryption keys. Note that once updated, any previous session cookies will be rejected. **Acknowledgement** Okta would like to thank Félix Charette for discovering this vulnerability.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | auth0/symfony (Packagist) | before 5.4.0 | 5.4.0 | Patch available | GHSA-9wg9-93h9-j8ch |
- auth0/symfony (Packagist) Vendor— Affected before 5.4.0 Fixed in 5.4.0 Patch available GHSA-9wg9-93h9-j8ch
Remediation
- Fix · GHSA-9wg9-93h9-j8ch auth0/symfony (Packagist) Fixed in 5.4.0 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-9wg9-93h9-j8ch
References
Sources
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