CVE-2023-50724: 
Ruby vulnerability analysis and mitigation

Resque (pronounced like "rescue"), a Redis-backed library for creating background jobs and processing them later, was found to contain a reflected XSS vulnerability in versions before 2.1.0. The vulnerability was discovered in the resque-web component, specifically affecting the current_queue parameter in the path of the queues endpoint. The issue was disclosed on April 17, 2019, and was patched in version 2.1.0 (GitHub Advisory).

The vulnerability is classified as a reflected cross-site scripting (XSS) issue where malicious code could be executed by the victim's browser through the pathname of the site. The vulnerability occurs due to insufficient validation of incoming requests, allowing manipulation of the web application's function and activation of malicious scripts. The CVSS v3.1 base score is 6.3 (Medium), with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N, indicating network attack vector, low attack complexity, low privileges required, and user interaction required (GitHub Advisory).

When exploited, this vulnerability allows attackers to execute arbitrary web scripts or HTML in the context of a victim's browser session. The impact includes potential data theft, session hijacking, or other malicious actions performed in the context of the affected user's session. The vulnerability requires user interaction, as the victim needs to click on a specially crafted link for the exploit to work (GitHub Issue).

The vulnerability has been patched in Resque version 2.1.0. Until patching is possible, it is recommended not to click on third-party or untrusted links to the resque-web interface. The fix involves proper HTML escaping of the currentqueue parameter using the ERB::Util#htmlescape function, which is already built into the Rails XSS protection mechanism (GitHub PR, GitHub Advisory).