GHSA-v427-c49j-8w6x

### Impact
**secretKey**, an important key for HMAC SHA256 authentication, was stored in the database in raw form.

If a malicious person somehow had access to the data in the database, they could use the key and secretKey for HMAC SHA256 authentication to send requests impersonating that person.

### Patches
Upgrade to Shield v1.0.0-beta.8 or later.

After upgrading, all existing secret keys must be encrypted.
See https://github.com/codeigniter4/shield/blob/develop/UPGRADING.md for details.

### Workarounds
None.

### References
- https://codeigniter4.github.io/shield/references/authentication/hmac/

### For more information
If you have any questions or comments about this advisory:
* Open an issue or discussion in [codeigniter4/shield](https://github.com/codeigniter4/shield)
* Email us at [[email protected]](mailto:[email protected])