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Vulnerabilities

Vulnerability · CVE-2026-40870

Decidim is a participatory democracy framework.

Published Apr 21, 2026 · catalog updated Jun 17, 2026 · Decidim is a participatory

Check if you run it

No confirmed exploitation is on record for CVE-2026-40870. EPSS is 0.39%. Act only if a listed version of Decidim is a participatory is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Decidim is a participatory).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
See sources for product scope

Decidim is a participatory democracy framework. Starting in version 0.0.1 and prior to versions 0.30.5 and 0.31.1, the root level field in the API allows access to all commentable resources within the platform, without any permission checks. All Decidim instances are impacted that have not secured the endpoint. The endpoint is publicly available with the default configuration. Versions 0.30.5 and 0.31.1 fix the issue. As a workaround, limit the scope to only authenticated users by limiting access to the endpoint. This would require custom code or installing the 3rd party module . With custom code, the endpoint can be limited to only authenticated users. The same configuration can be also used without the statements to disable all traffic to the the endpoint. When considering a workaround and the seriousness of the vulnerability, please consider the nature of the platform. If the platform is primarily serving public data, this vulnerability is not serious by its nature. If the platform is protecting some resources, e.g. inside private participation spaces, the vulnerability may expose some data to the attacker that is not meant public. For those who have enabled the organization setting "Force users to authenticate before access organization", the scope of this vulnerability is limited to the users who are allowed to log in to the Decidim platform. This setting was introduced in version 0.19.0 and it was applied to the endpoint in version 0.22.0.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-40870

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40870. EPSS is 0.39%. Act only if a listed version of Decidim is a participatory is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-862: Missing Authorization. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 21, 2026 · NIST NVD

    Detected

    Decidim is a participatory democracy framework. Starting in version 0.0.1 and prior to versions 0.30.5 and 0.31.1, the root level field in the API allows access to all commentable resources within the platform, without any permission checks. All Decidim instances are impacted that have not secured the endpoint. The endpoint is publicly available with the default configuration. Versions 0.30.5 and

  2. Jun 17, 2026 · NIST NVD

    Updated

    Decidim is a participatory democracy framework. Starting in version 0.0.1 and prior to versions 0.30.5 and 0.31.1, the root level field in the API allows access to all commentable resources within the platform, without any permission checks. All Decidim instances are impacted that have not secured the endpoint. The endpoint is publicly available with the default configuration. Versions 0.30.5 and

Sources

  • CVE.orgVulnerability recordCVE-2026-40870

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40870

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40870

    Decidim is a participatory democracy framework. Starting in version 0.0.1 and prior to versions 0.30.5 and 0.31.1, the root level field in the API allows access to all commentable resources within the platform, without any permission checks. All Decidim instances ar

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.