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CVE-2026-40869

Decidim amendments can be accepted or rejected by anyone

Published: Apr 21, 2026Updated: Apr 23, 2026 Sources: CVE List NVDCWE-266
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.2%
Top 87.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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).

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-266

Affected Products

decidimdecidim
On-prem
Enterprise Software / collaboration-groupware
decidimoss-projectEnterprise Softwareaka decidim framework

Exploitability

Official Patch Available
Workaround Available

References

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

Timeline

Published
Apr 21, 2026
Last Updated
Apr 23, 2026

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