CVE-2023-34089: Decidim

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Decidim is a participatory democracy framework, written in Ruby on Rails, originally developed for the Barcelona City government online and offline participation website. The processes filter feature is susceptible to Cross-site scripting. This allows a remote attacker to execute JavaScript code in the context of a currently logged-in user. An attacker could use this vulnerability to make other users endorse or support proposals they have no intention of supporting or endorsing. The problem was patched in version 0.27.3 and 0.26.7.

Affected products

• Decidim Decidim: before 0.26.7 (fixed in 0.26.7); from 0.27.0, before 0.27.3 (fixed in 0.27.3)

Published 2023-07-11. Last modified 2026-06-17.