CVE-2026-40869

HIGH 7.5

Decidim amendments can be accepted or rejected by anyone

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Decidim is a participatory democracy framework. Starting in version 0.19.0 and prior to versions 0.30.5 and 0.31.1, a vulnerability allows any registered and authenticated user to accept or reject any amendments. The impact is on any users who have created proposals where the amendments feature is enabled. This also elevates the user accepting the amendment as the author of the original proposal as people amending proposals are provided coauthorship on the coauthorable resources. Versions 0.30.5 and 0.31.1 fix the issue. As a workaround, disable amendment reactions for the amendable component (e.g. proposals).

CWE	CWE-266
Vendor	decidim
Product	decidim
Published	Apr 21, 2026
Last Updated	Apr 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

decidim / decidim

>= 0.31.0.rc1, < 0.31.1 >= 0.19.0, < 0.30.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/decidim/decidim/security/advisories/GHSA-w5xj-99cg-rccm github.com: https://github.com/decidim/decidim/commit/1b99136a1c7aa02616a0b54a6ab88d12907a57a9