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Vulnerability record · CVE-2023-34089 · published 11 July 2023

CVE-2023-34089: Decidim cross-site scripting vulnerability

Decidim · Decidim

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.

6.1 CVSS 3.1 Medium EPSS 0.74% · top 47.4% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/decidim/decidim/releases/tag/v0.26.6 Release Notes
https://github.com/decidim/decidim/releases/tag/v0.27.3 Release Notes
https://github.com/decidim/decidim/security/advisories/GHSA-5652-92r9-3fx9 Third Party Advisory
https://github.com/decidim/decidim/releases/tag/v0.26.6 Release Notes
https://github.com/decidim/decidim/releases/tag/v0.27.3 Release Notes
https://github.com/decidim/decidim/security/advisories/GHSA-5652-92r9-3fx9 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-34089), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.