Decidim has race condition in Endorsements
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
Decidim is a participatory democracy framework. Starting in version 0.10.0 and prior to versions 0.26.9, 0.27.5, and 0.28.0, a race condition in the endorsement of resources (for instance, a proposal) allows a user to make more than once endorsement. To exploit this vulnerability, the request to set an endorsement must be sent several times in parallel. Versions 0.26.9, 0.27.5, and 0.28.0 contain a patch for this issue. As a workaround, disable the Endorsement feature in the components.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 | 0.10.0 to before 0.26.9; 0.27.0 to before 0.27.5 | 0.26.9, 0.27.5 | Patch available | CNA |
| — | decidim (RubyGems) | 0.10.0 to before 0.26.9 | 0.26.9 | Patch available | GHSA-r275-j57c-7mf2 |
| — | decidim (RubyGems) | 0.27.0 to before 0.27.5 | 0.27.5 | Patch available | GHSA-r275-j57c-7mf2 |
- decidim Vendordecidim Affected 0.10.0 to before 0.26.9; 0.27.0 to before 0.27.5 Fixed in 0.26.9, 0.27.5 Patch available CNA
- decidim (RubyGems) Vendor— Affected 0.10.0 to before 0.26.9 Fixed in 0.26.9 Patch available GHSA-r275-j57c-7mf2
- decidim (RubyGems) Vendor— Affected 0.27.0 to before 0.27.5 Fixed in 0.27.5 Patch available GHSA-r275-j57c-7mf2
Remediation
- Fix · CNA decidim (decidim) Fixed in 0.26.9, 0.27.5
- Fix · GHSA-r275-j57c-7mf2 decidim (RubyGems) Fixed in 0.26.9 Advisory →
- Fix · GHSA-r275-j57c-7mf2 decidim (RubyGems) Fixed in 0.27.5 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-47634
- 2026-10-03 Alias added: GHSA-r275-j57c-7mf2
References
Advisory 2
Other 7
- https://github.com/decidim/decidim/releases/tag/v0.26.9
- https://github.com/decidim/decidim/releases/tag/v0.27.5
- https://github.com/decidim/decidim/releases/tag/v0.28.0
- https://github.com/decidim/decidim/commit/5c5ee7a50d75c10643dd8c495e2517641e4d74db
- https://github.com/decidim/decidim/commit/7b840d2c37a562709f4481db644d8c43add28536
- https://github.com/decidim/decidim
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2023-47634.yml
More Decidim vulnerabilities
- TI-2025-40203 Decidim's private data exports can lead to data leaks CVSS 4.0HIGH 8.2
- TI-2023-16936 Decidim vulnerable to sensitive data disclosure CVSS 3.1HIGH 7.5
- 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
Sources
- CVE-2023-47634 · CVE Program
- CVE-2023-47634 · NVD
- FIRST EPSS
- GHSA-r275-j57c-7mf2 · 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