What is CVE-2026-45086?

CVE-2026-45086 is a medium-severity security vulnerability in decidim-demographics (rubygems), affecting versions >= 0.31.0, < 0.31.5. It is fixed in 0.31.5, 0.32.0.

How severe is CVE-2026-45086?

CVE-2026-45086 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of decidim-demographics are affected by CVE-2026-45086?

decidim-demographics (rubygems) versions >= 0.31.0, < 0.31.5 is affected.

Is there a fix for CVE-2026-45086?

Yes. CVE-2026-45086 is fixed in 0.31.5, 0.32.0. Upgrade to this version or later.

Is CVE-2026-45086 exploitable, and should I be worried?

Whether CVE-2026-45086 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2026-45086 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix CVE-2026-45086?

Upgrade: decidim-demographics to 0.31.5 or later, decidim-demographics to 0.32.0 or later.

CVE-2026-45086 in decidim-demographics

Q: How severe is CVE-2026-45086?

CVE-2026-45086 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of decidim-demographics are affected by CVE-2026-45086?

decidim-demographics (rubygems) versions >= 0.31.0, < 0.31.5 is affected.

Q: Is there a fix for CVE-2026-45086?

Yes. CVE-2026-45086 is fixed in 0.31.5, 0.32.0. Upgrade to this version or later.

Q: Is CVE-2026-45086 exploitable, and should I be worried?

Whether CVE-2026-45086 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2026-45086 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2026-45086?

Upgrade: decidim-demographics to 0.31.5 or later, decidim-demographics to 0.32.0 or later.

Summary

Decidim: Forms admin question editor lacks authorization

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:

Note that access was denied when attempting to see question responses or settings.

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.

Impact

Low-privilege users can access questionnaire-admin interfaces.
They can read question-management surfaces that should remain limited to questionnaire managers.

CVE-2026-45086 has a CVSS score of 5.4 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.31.5, 0.32.0); upgrading removes the vulnerable code path.

Affected versions

decidim-demographics (>= 0.31.0, < 0.31.5) decidim-demographics (>= 0.32.0.rc1, < 0.32.0)

Security releases

decidim-demographics → 0.31.5 (rubygems) decidim-demographics → 0.32.0 (rubygems)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

See https://github.com/decidim/decidim/pull/16665

Frequently Asked Questions

What is CVE-2026-45086? CVE-2026-45086 is a medium-severity security vulnerability in decidim-demographics (rubygems), affecting versions >= 0.31.0, < 0.31.5. It is fixed in 0.31.5, 0.32.0.
How severe is CVE-2026-45086? CVE-2026-45086 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of decidim-demographics are affected by CVE-2026-45086? decidim-demographics (rubygems) versions >= 0.31.0, < 0.31.5 is affected.
Is there a fix for CVE-2026-45086? Yes. CVE-2026-45086 is fixed in 0.31.5, 0.32.0. Upgrade to this version or later.
Is CVE-2026-45086 exploitable, and should I be worried? Whether CVE-2026-45086 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2026-45086 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2026-45086?
- Upgrade decidim-demographics to 0.31.5 or later
- Upgrade decidim-demographics to 0.32.0 or later