Decidim vulnerable to data disclosure through the embed feature
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · 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. If an attacker can infer the slug or URL of an unpublished or private resource, and this resource can be embbeded (such as a Participatory Process, an Assembly, a Proposal, a Result, etc), then some data of this resource could be accessed. This vulnerability is fixed in 0.27.6.
Why it matters now
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 | before 0.27.6 | 0.27.6 | Patch available | CNA |
| — | decidim (RubyGems) | before 0.27.6 | 0.27.6 | Patch available | GHSA-qcj6-vxwx-4rqv |
- decidim Vendordecidim Affected before 0.27.6 Fixed in 0.27.6 Patch available CNA
- decidim (RubyGems) Vendor— Affected before 0.27.6 Fixed in 0.27.6 Patch available GHSA-qcj6-vxwx-4rqv
Remediation
- Fix · CNA decidim (decidim) Fixed in 0.27.6
- Fix · GHSA-qcj6-vxwx-4rqv decidim (RubyGems) Fixed in 0.27.6 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-27090
- 2026-10-03 Alias added: GHSA-qcj6-vxwx-4rqv
References
Other 6
- https://github.com/decidim/decidim/security/advisories/GHSA-qcj6-vxwx-4rqv
- https://github.com/decidim/decidim/pull/12528
- https://github.com/decidim/decidim/commit/1756fa639ef393ca8e8bb16221cab2e2e7875705
- https://github.com/decidim/decidim/releases/tag/v0.27.6
- https://github.com/decidim/decidim
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2024-27090.yml
More decidim vulnerabilities
- TI-2026-33169 Decidim: Verification documents can be downloaded through reusable links CVSS 3.1HIGH 7.5
- TI-2025-40203 Decidim's private data exports can lead to data leaks CVSS 4.0HIGH 8.2
- TI-2026-33203 Decidim: JWT-backed authentication can be replayed across organizations CVSS 3.1HIGH 8.5
- TI-2026-33168 Decidim: Private exports can be downloaded through reusable links CVSS 3.1MEDIUM 6.5
- TI-2026-33204 Decidim: CSV census record endpoints improper authorization CVSS 3.1MEDIUM 6.0
- TI-2026-33167 Decidim: Admin user search allows SQL injection through similarity-based sorting CVSS 3.1MEDIUM 5.5
Sources
- CVE-2024-27090 · CVE Program
- CVE-2024-27090 · NVD
- FIRST EPSS
- GHSA-qcj6-vxwx-4rqv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences