GHSA-ghc5-95c2-vwcv
Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption
Impact
In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.
Am I Affected?
Consumers are affected if their application meets the following preconditions:
- It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0
- Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.
Resolution
Upgrade Auth0/symfony-auth0 to version 5.8.0 or greater.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
What each source reports
GitHub Advisories Score used
Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption
Impact
In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.
Am I Affected?
Consumers are affected if their application meets the following preconditions:
- It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0
- Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.
Resolution
Upgrade Auth0/symfony-auth0 to version 5.8.0 or greater.
- Record
GHSA-ghc5-95c2-vwcv- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
OSV
Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption
Impact
In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.
Am I Affected?
Consumers are affected if their application meets the following preconditions:
- It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0
- Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.
Resolution
Upgrade Auth0/symfony-auth0 to version 5.8.0 or greater.
- Record
GHSA-ghc5-95c2-vwcv- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N - Weakness
- CWE-331
- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
auth0/symfonyPackagist | 5.0.0 to 5.7.0 | 5.8.0 |
auth0/symfonyPackagist | 5.0.0 up to 5.8.0, plus listed versions 5.1.05.2.05.2.15.2.25.2.3 Show 7 moreShow less5.3.05.3.15.4.05.4.15.5.05.6.05.7.0 | 5.8.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-ghc5-95c2-vwcv is a high vulnerability (CVSS 8.2) in auth0/symfony, published April 3, 2026. No source lists public exploit code. Fixed in auth0/symfony 5.8.0.