What’s Vulnerable › Vulnerabilities

CVE-2023-34090: Decidim vulnerable to sensitive data disclosure

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-11 · updated 2026-06-17
• Weakness: CWE-200

Description

Decidim is a participatory democracy framework, written in Ruby on Rails, originally developed for the Barcelona City government online and offline participation website. Decidim uses a third-party library named Ransack for filtering certain database collections (e.g., public meetings). By default, this library allows filtering on all data attributes and associations. This allows an unauthenticated remote attacker to exfiltrate non-public data from the underlying database of a Decidim instance (e.g., exfiltrating data from the user table). This issue may lead to Sensitive Data Disclosure. The problem was patched in version 0.27.3.

Affected products

• decidim: before 0.27.3 — fixed in 0.27.3

How to fix

Upgrade to a fixed version: decidim 0.27.3. Check the vendor advisory for mitigations.

References

• https://github.com/decidim/decidim/releases/tag/v0.27.3
• https://github.com/decidim/decidim/security/advisories/GHSA-jm79-9pm4-vrw9
• https://github.com/decidim/decidim/security/advisories/GHSA-jm79-9pm4-vrw9#advisory-comment-81110
• https://github.com/decidim/decidim/releases/tag/v0.27.3
• https://github.com/decidim/decidim/security/advisories/GHSA-jm79-9pm4-vrw9
• https://github.com/decidim/decidim/security/advisories/GHSA-jm79-9pm4-vrw9#advisory-comment-81110

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