CVE-2024-27090: 
Ruby vulnerability analysis and mitigation

Decidim, a participatory democracy framework written in Ruby on Rails, contains a vulnerability (CVE-2024-27090) that allows unauthorized access to unpublished or private resources through the embed feature. The vulnerability was discovered and disclosed on July 10, 2024, affecting versions up to 0.27.4, and has been fixed in version 0.27.6 (Decidim Release).

The vulnerability allows an attacker to access data from unpublished or private resources if they can infer the slug or URL of these resources. This affects various embeddable resources such as Participatory Processes, Assemblies, Proposals, and Results. The vulnerability has been assigned a CVSS v3.1 score of 5.3 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, indicating network accessibility with low attack complexity and no required privileges or user interaction (GitHub Advisory).

The vulnerability could lead to unauthorized disclosure of sensitive information from unpublished or private resources within the Decidim platform. This includes data from various types of resources that support embedding functionality, potentially exposing content that was intended to remain private or unpublished (GitHub Advisory).

The vulnerability can be exploited by an attacker who can infer the slug or URL of an unpublished or private resource that supports embedding. No special privileges or user interaction is required for exploitation (GitHub Advisory).

The vulnerability has been fixed in Decidim version 0.27.6. For users unable to update immediately, a workaround is available by disallowing access through the web server to URLs ending with /embed.html. Organizations are recommended to upgrade to the patched version to ensure complete protection (GitHub Advisory, Decidim Release).