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).
History

Thu, 23 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:*

Wed, 22 Apr 2026 05:00:00 +0000

Type Values Removed Values Added
First Time appeared Decidim
Decidim decidim
Vendors & Products Decidim
Decidim decidim

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Description 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).
Title Decidim amendments can be accepted or rejected by anyone
Weaknesses CWE-266
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-21T19:08:28.239Z

Updated: 2026-04-21T19:35:55.139Z

Reserved: 2026-04-15T15:57:41.718Z

Link: CVE-2026-40869

cve-icon Vulnrichment

Updated: 2026-04-21T19:35:51.743Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-21T20:17:00.207

Modified: 2026-04-23T16:08:50.607

Link: CVE-2026-40869

cve-icon Redhat

No data.