[publify_core] Cross site scripting in publify

Unrestricted file upload allowed the attacker to manipulate the request and bypass the protection of HTML files using a text file. Stored XSS may be obtained.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-1811
• https://github.com/publify/publify/commit/0fb6b027fbaf17f6a6551f2148482a03eac12927
• https://huntr.dev/bounties/4d97f665-c9f1-4c38-b774-692255a7c44c
• https://github.com/advisories/GHSA-3hwx-c6cp-q972