CVE-2026-45415: Decidim CSV Census Record Endpoints Improper Vulnerability

MODERATE
Advisory Identifier: GHSA-q79h-67vx-m9xg
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CVSS 6.0
CWE-285
Published
Advisory Summary

CVE-2026-45415 is a MODERATE (CVSS 6.0) csv census record endpoints improper vulnerability (CWE-285: Improper Authorization) affecting Decidim libraries in the RubyGems ecosystem. The issue involves csv census record endpoints improper authorization. Remediation is available by upgrading affected packages to version 0.30.9, 0.31.5, 0.32.0.

CVE-2026-45415 at a Glance

CVE Identifier CVE-2026-45415
GHSA Identifier GHSA-q79h-67vx-m9xg
Severity MODERATE
CVSS v3.1 Base Score 6.0
CWE Classification CWE-285: Improper Authorization
Affected Product Decidim
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 6.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity High (I:H)
Availability Low (A:L)

How to Fix CVE-2026-45415

To remediate this vulnerability, upgrade all affected Decidim dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

decidim-verifications fixed: 0.30.9 
Upgrade decidim-verifications to 0.30.9
decidim-verifications fixed: 0.31.5 
Upgrade decidim-verifications to 0.31.5
decidim-verifications fixed: 0.32.0 
Upgrade decidim-verifications to 0.32.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for decidim-verifications

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-45415, inspect your project dependencies for Decidim:

inspect dependencies for decidim-verifications

Analyze the terminal output to locate any version of Decidim in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.30.9), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-285: Improper Authorization, where the product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. In Decidim, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## 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. <img width="1541" height="274" alt="decidim-census-01" src="https://github.com/user-attachments/assets/859ee101-746f-4acb-8051-27036689f1b3" /> <img width="1538" height="363" alt="decidim-census-02" src="https://github.com/user-attachments/assets/85bbb004-a999-46dc-856c-fd32b50ced2c" /> 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 https://github.com/decidim/decidim/pull/16674 and https://github.com/decidim/decidim/pull/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](https://decidim.org) and made by [Radically Open Security](https://www.radicallyopensecurity.com/) against Decidim financed by [NGI](https://ngi.eu/).

CVE-2026-45415 Affected Decidim Versions

3 component(s)
Fixed Versions:
0.30.90.31.50.32.0
Product / Package Ecosystem Affected Versions Fixed Version
decidim-verifications
gem/decidim-verifications
RubyGems
< 0.30.9
0.30.9
decidim-verifications
gem/decidim-verifications
RubyGems
≥ 0.31.0.rc1
< 0.31.5
0.31.5
decidim-verifications
gem/decidim-verifications
RubyGems
≥ 0.32.0.rc1
< 0.32.0
0.32.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/decidim/decidim/security/advisories/GHSA-q79h-67vx-m9xg
Decidim Source Repository REPOSITORY
https://github.com/decidim/decidim/pull/16674
Decidim Source Repository REPOSITORY
https://github.com/decidim/decidim/pull/16703
Decidim Source Repository REPOSITORY
https://github.com/decidim/decidim

Frequently Asked Questions

What is CVE-2026-45415?
CVE-2026-45415 is a security vulnerability in Decidim involving CSV census record endpoints improper authorization under CWE-285: Improper Authorization.
Which Decidim versions are affected?
Affected versions include releases prior to 0.30.9, 0.31.5, 0.32.0 across affected packages: decidim-verifications.
What version fixes CVE-2026-45415?
Upgrading to 0.30.9, 0.31.5, 0.32.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is decidim-verifications affected?
Yes, decidim-verifications is affected in releases prior to 0.30.9, 0.31.5, 0.32.0. Upgrade your dependency to 0.30.9, 0.31.5, 0.32.0 or later.
What is the CVSS score of CVE-2026-45415?
CVE-2026-45415 has a CVSS v3.1 base score of 6.0 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:L.
What CWE is associated with CVE-2026-45415?
CVE-2026-45415 is classified under CWE-285: 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.).
How can I check RubyGems dependencies for CVE-2026-45415?
Run the dependency tree command: 'inspect dependencies for decidim-verifications'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q79h-67vx-m9xg",
  "modified" : "2026-07-13T17:17:33Z",
  "published" : "2026-07-13T17:17:33Z",
  "aliases" : [ "CVE-2026-45415" ],
  "summary" : "Decidim: CSV census record endpoints improper authorization",
  "details" : "## Description\n\nA participant manager can access and modify the CSV census record admin forms.\n\n## Technical description\n\nThe 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`.\n\nA participant manager (which can only manage participants) can therefore open the admin forms, create or update census rows, and delete rows directly.\n\nReproduction steps:\n1. 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.\n\n<img width=\"1541\" height=\"274\" alt=\"decidim-census-01\" src=\"https://github.com/user-attachments/assets/859ee101-746f-4acb-8051-27036689f1b3\" />\n\n<img width=\"1538\" height=\"363\" alt=\"decidim-census-02\" src=\"https://github.com/user-attachments/assets/85bbb004-a999-46dc-856c-fd32b50ced2c\" />\n\nNote that normal participant accounts were not able to access the CSV census records which is good.\n\n### Impact\n \nAny participant admin can create, alter, or remove CSV census rows, which can corrupt verification data relied on by authorization workflows.\n\n### Patches\n\nSee https://github.com/decidim/decidim/pull/16674 and https://github.com/decidim/decidim/pull/16703 \n\n### Workarounds\n\nDisable Organization Census verification method\n\n### Reference\n\nOWASP A01:2021 Broken Access Control\n\n### Credits\n\nThis issue was discovered in a security audit organized by the [Decidim Association](https://decidim.org) and made by [Radically Open Security](https://www.radicallyopensecurity.com/) against Decidim financed by [NGI](https://ngi.eu/).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-verifications"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.30.9"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-verifications"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.31.0.rc1"
      }, {
        "fixed" : "0.31.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-verifications"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.32.0.rc1"
      }, {
        "fixed" : "0.32.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/security/advisories/GHSA-q79h-67vx-m9xg"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/pull/16674"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/pull/16703"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/decidim/decidim"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-285" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-13T17:17:33Z",
    "nvd_published_at" : null
  }
}