CVE-2026-40869

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).
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:*
cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:*

History

17 Jun 2026, 10:45

Type Values Removed Values Added
References () https://github.com/decidim/decidim/security/advisories/GHSA-w5xj-99cg-rccm - Mitigation, Vendor Advisory, Patch () https://github.com/decidim/decidim/security/advisories/GHSA-w5xj-99cg-rccm - Mitigation, Patch, Vendor Advisory

23 Apr 2026, 16:08

Type Values Removed Values Added
References () https://github.com/decidim/decidim/commit/1b99136a1c7aa02616a0b54a6ab88d12907a57a9 - () https://github.com/decidim/decidim/commit/1b99136a1c7aa02616a0b54a6ab88d12907a57a9 - Patch
References () https://github.com/decidim/decidim/security/advisories/GHSA-w5xj-99cg-rccm - () https://github.com/decidim/decidim/security/advisories/GHSA-w5xj-99cg-rccm - Mitigation, Vendor Advisory, Patch
First Time Decidim
Decidim decidim
CPE cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:*

21 Apr 2026, 20:17

Type Values Removed Values Added
New CVE

Information

Published : 2026-04-21 20:17

Updated : 2026-06-17 10:45


NVD link : CVE-2026-40869

Mitre link : CVE-2026-40869

CVE.ORG link : CVE-2026-40869


JSON object : View

Products Affected

decidim

  • decidim
CWE
CWE-266

Incorrect Privilege Assignment