decidim-demographics CVE-2026-45086
MEDIUM
GHSA-vq6j-hj8w-7v39
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Network-accessible missing authorization requires only a low-privilege authenticated session; confidentiality and integrity impacts are both low as only the question editor surface is exposed, with no availability impact.
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionGitHub Advisory
Description
A participant can load the demographics questionnaire admin editor and make changes.
Technical description
The demographics questionnaire editor should require admin access, but the route under /admin/demographics/questions renders the editor interface without checking whether the caller is an admin. A normal participant can load the page and see the live update form action, which proves the protected interface is reachable.
Reproduction steps:
Step 1. Sign in as a normal participant: Open http://localhost:3000/users/sign_in. Step 2. Request the admin-only editor directly. Open http://localhost:3000/admin/demographics/questions/edit_questions in the same browser. Step 3. Add another question:
<img width="1522" height="1174" alt="decidim-questions-01" src="https://github.com/user-attachments/assets/923f85d4-0e2f-4511-a9f3-a92f74dbf1d8" />
Note that access was denied when attempting to see question responses or settings.
Impact
- Low-privilege users can access questionnaire-admin interfaces.
- They can read question-management surfaces that should remain limited to questionnaire managers.
Patches
See https://github.com/decidim/decidim/pull/16665
Workarounds
Disable the "decidim-demographics" module
Reference
OWASP A01:2021 Broken Access Control
Credits
This issue was discovered in a security audit organized by the Decidim Association and made by Radically Open Security against Decidim financed by NGI.
AnalysisAI
Unauthorized access to the demographics questionnaire admin editor in Decidim's decidim-demographics module allows any authenticated participant to reach and interact with the /admin/demographics/questions/edit_questions route without admin privileges. Affected versions span 0.31.0-0.31.4 and 0.32.0.rc1, with fixes released in 0.31.5 and 0.32.0. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an active authenticated session as any registered participant (no admin role needed) on a Decidim instance running `decidim-demographics` >= 0.31.0 and < 0.31.5, or >= 0.32.0.rc1 and < 0.32.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 5.4 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N) is an accurate reflection of actual risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A registered participant on a Decidim civic platform authenticates with their normal account credentials and navigates directly to `/admin/demographics/questions/edit_questions`. Because the route renders without invoking the admin permission check, the question editor interface is presented in full. … |
| Remediation | Upgrade `decidim-demographics` to version 0.31.5 if running the 0.31.x series, or to 0.32.0 if running the 0.32.x series. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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