[publify_core] Improper Authorization in Publify

In Publify, 9.0.0.pre1 to 9.2.4 are vulnerable to Improper Access Control. “guest” role users can self-register even when the admin does not allow. This happens due to front-end restriction only.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-25973
• https://github.com/publify/publify/commit/3447e0241e921b65f6eb1090453d8ea73e98387e
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25973
• https://github.com/advisories/GHSA-x24j-87×9-jvv5