Decidim vulnerable to data disclosure through the embed feature

Impact

If an attacker can infer the slug or URL of an unpublished or private resource, and this resource can be embedded (such as a Participatory Process, an Assembly, a Proposal, a Result, etc), then some data of this resource could be accessed.

Patches

version 0.27.6

https://github.com/decidim/decidim/commit/1756fa639ef393ca8e8bb16221cab2e2e7875705

Workarounds

Disallow access through your web server to the URLs finished with /embed.html