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Decidim: CSV census record endpoints improper authorization

Moderate severity GitHub Reviewed Published Jul 13, 2026 in decidim/decidim • Updated Jul 13, 2026

Package

bundler decidim-verifications (RubyGems)

Affected versions

< 0.30.9
>= 0.31.0.rc1, < 0.31.5
>= 0.32.0.rc1, < 0.32.0

Patched versions

0.30.9
0.31.5
0.32.0

Description

Description

A participant manager can access and modify the CSV census record admin forms.

Technical description

The CSV census admin record-management surface under /admin/csv_census/census_logs does not enforce admin-only authorization before rendering or mutating Decidim::Verifications::CsvDatum.

A participant manager (which can only manage participants) can therefore open the admin forms, create or update census rows, and delete rows directly.

Reproduction steps:

  1. Sign in a participant admin and open http://localhost:3000/admin/csv_census/census_logs/new_record in the browser. Confirm the create form loads even though the session is not a full admin.

decidim-census-01

decidim-census-02

Note that normal participant accounts were not able to access the CSV census records which is good.

Impact

Any participant admin can create, alter, or remove CSV census rows, which can corrupt verification data relied on by authorization workflows.

Patches

See decidim/decidim#16674 and decidim/decidim#16703

Workarounds

Disable Organization Census verification method

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.

References

@andreslucena andreslucena published to decidim/decidim Jul 13, 2026
Published to the GitHub Advisory Database Jul 13, 2026
Reviewed Jul 13, 2026
Last updated Jul 13, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:L

EPSS score

Weaknesses

Improper Authorization

The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Learn more on MITRE.

CVE ID

CVE-2026-45415

GHSA ID

GHSA-q79h-67vx-m9xg

Source code

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