CVE-2026-40869: high-severity vulnerability in decidim
Decidim amendments can be accepted or rejected by anyone
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.2%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
decidim · decidimRelated CVEs — decidim
In the same product, most dangerous first.
CVE-2023-34090HIGHDecidim vulnerable to sensitive data disclosureEPSS 1.3%CVE-2023-32693HIGHDecidim Cross-site Scripting vulnerability in the external link redirectionsEPSS 0.8%CVE-2023-48220MEDIUMDecidim's devise_invitable gem vulnerable to circumvention of invitation token expiry periodEPSS 0.8%CVE-2023-34089HIGHDecidim Cross-site Scripting vulnerability in the processes filterEPSS 0.7%CVE-2023-36465CRITICALDecidim has broken access control in templatesEPSS 0.7%CVE-2026-45376MEDIUMDecidim: Admin user search allows SQL injection through similarity-based sortingEPSS 0.6%