TI-2023-16936 Aliases CVE-2023-34090 GHSA-jm79-9pm4-vrw9

Decidim vulnerable to sensitive data disclosure

MEDIUM 41CWE-200Published 2023-07-11 · Updated 2024-10-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0126 69th percentileScored 2026-11-07

Fix Fixed decidim (decidim): 0.27.3decidim (RubyGems): 0.27.3+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
decidim	decidim	0.27.0 to before 0.27.3	0.27.3	Patch available	CNA
—	decidim (RubyGems)	0.27.0 to before 0.27.3	0.27.3	Patch available	GHSA-jm79-9pm4-vrw9
—	decidim-meetings (RubyGems)	0.27.0 to before 0.27.3	0.27.3	Patch available	GHSA-jm79-9pm4-vrw9

decidim Vendordecidim Affected 0.27.0 to before 0.27.3 Fixed in 0.27.3 Patch available CNA
decidim (RubyGems) Vendor— Affected 0.27.0 to before 0.27.3 Fixed in 0.27.3 Patch available GHSA-jm79-9pm4-vrw9
decidim-meetings (RubyGems) Vendor— Affected 0.27.0 to before 0.27.3 Fixed in 0.27.3 Patch available GHSA-jm79-9pm4-vrw9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:decidim:decidim::::::ruby::*	before 0.27.3	Vulnerable	decidim

cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:* Versions before 0.27.3 Vulnerable ·decidim

Remediation

Fix · CNA decidim (decidim) Fixed in 0.27.3
Fix · GHSA-jm79-9pm4-vrw9 decidim (RubyGems) Fixed in 0.27.3 Advisory →
Fix · GHSA-jm79-9pm4-vrw9 decidim-meetings (RubyGems) Fixed in 0.27.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-34090
2026-10-03 Alias added: GHSA-jm79-9pm4-vrw9

References

Patch 1

https://github.com/decidim/decidim/releases/tag/v0.27.3

Advisory 3

Other 3

TI-2025-40203 Decidim's private data exports can lead to data leaks CVSS 4.0HIGH 8.2
TI-2026-19249 Decidim has a Cross-site scripting (XSS) vulnerability via user name field CVSS 4.0CRITICAL 9.3
TI-2023-18306 Decidim has broken access control in templates CVSS 3.1CRITICAL 9.1
TI-2023-16935 Decidim Cross-site Scripting vulnerability in the processes filter CVSS 3.1HIGH 8.1
TI-2023-15969 Decidim Cross-site Scripting vulnerability in the external link redirections CVSS 3.1HIGH 8.1
TI-2026-29525 Decidim amendments can be accepted or rejected by anyone CVSS 3.1HIGH 7.5

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences