Decidim has broken access control in templates
Priority MEDIUM 40CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.
Summary
Decidim is a participatory democracy framework, written in Ruby on Rails, originally developed for the Barcelona City government online and offline participation website. The `templates` module doesn't enforce the correct permissions, allowing any logged-in user to access to this functionality in the administration panel. An attacker could use this vulnerability to change, create or delete templates of surveys. This issue has been patched in version 0.26.8 and 0.27.4.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00674 52nd percentileScored 2026-11-07
Fix Fixed decidim (decidim): 0.26.8, 0.27.4decidim (RubyGems): 0.26.8, 0.27.4+1 more product
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 | 0.23.2 to before 0.26.8; 0.27.0 to before 0.27.4 | 0.26.8, 0.27.4 | Patch available | CNA |
| — | decidim (RubyGems) | 0.23.2 to before 0.26.8 | 0.26.8 | Patch available | GHSA-639h-86hw-qcjq |
| — | decidim-templates (RubyGems) | 0.23.2 to before 0.26.8 | 0.26.8 | Patch available | GHSA-639h-86hw-qcjq |
| — | decidim-templates (RubyGems) | 0.27.0 to before 0.27.4 | 0.27.4 | Patch available | GHSA-639h-86hw-qcjq |
| — | decidim (RubyGems) | 0.27.0 to before 0.27.4 | 0.27.4 | Patch available | GHSA-639h-86hw-qcjq |
- decidim Vendordecidim Affected 0.23.2 to before 0.26.8; 0.27.0 to before 0.27.4 Fixed in 0.26.8, 0.27.4 Patch available CNA
- decidim (RubyGems) Vendor— Affected 0.23.2 to before 0.26.8 Fixed in 0.26.8 Patch available GHSA-639h-86hw-qcjq
- decidim-templates (RubyGems) Vendor— Affected 0.23.2 to before 0.26.8 Fixed in 0.26.8 Patch available GHSA-639h-86hw-qcjq
- decidim-templates (RubyGems) Vendor— Affected 0.27.0 to before 0.27.4 Fixed in 0.27.4 Patch available GHSA-639h-86hw-qcjq
- decidim (RubyGems) Vendor— Affected 0.27.0 to before 0.27.4 Fixed in 0.27.4 Patch available GHSA-639h-86hw-qcjq
Remediation
- Fix · CNA decidim (decidim) Fixed in 0.26.8, 0.27.4
- Fix · GHSA-639h-86hw-qcjq decidim (RubyGems) Fixed in 0.26.8 Advisory →
- Fix · GHSA-639h-86hw-qcjq decidim-templates (RubyGems) Fixed in 0.26.8 Advisory →
- Fix · GHSA-639h-86hw-qcjq decidim-templates (RubyGems) Fixed in 0.27.4 Advisory →
- Fix · GHSA-639h-86hw-qcjq decidim (RubyGems) Fixed in 0.27.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-36465
- 2026-10-03 Alias added: GHSA-639h-86hw-qcjq
- 2026-10-06 EPSS moved to the 50th–90th percentile
References
Advisory 2
Other 5
- https://github.com/decidim/decidim/releases/tag/v0.26.8
- https://github.com/decidim/decidim/releases/tag/v0.27.4
- https://github.com/decidim/decidim
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-templates/CVE-2023-36465.yml
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2023-36465.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-2023-16935 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
Sources
- CVE-2023-36465 · CVE Program
- CVE-2023-36465 · NVD
- FIRST EPSS
- GHSA-639h-86hw-qcjq · 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