[publify_core] Cross site scripting in publify

In publify, versions v8.0 to v9.2.4 are vulnerable to stored XSS as a result of an unrestricted file upload. This issue allows a user with “publisher” role to inject malicious JavaScript via the uploaded html file.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-25975
• https://github.com/publify/publify/commit/d99c0870d3dbbfde7febdc6cad33199b84770101
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25974
• https://github.com/advisories/GHSA-3h7v-wqw7-ff28