CVE-2026-40869— Decidim amendments can be accepted or rejected by anyone
Quick assessment
Affected
decidim decidim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Decidim是Decidim开源的一个参与式民主框架，用 Ruby on Rails 编写。 Decidim 0.19.0版本至0.30.5和0.31.1之前版本存在安全漏洞，该漏洞源于允许任何注册且经过身份验证的用户接受或拒绝任何修订，可能导致用户权限提升。
Possible ATT&CK Techniques 1 AI
T1133 · External Remote Services
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I. Basic Information for CVE-2026-40869
Vulnerability Information
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Vulnerability Title
Decidim amendments can be accepted or rejected by anyone
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Decidim 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Decidim是Decidim开源的一个参与式民主框架，用 Ruby on Rails 编写。 Decidim 0.19.0版本至0.30.5和0.31.1之前版本存在安全漏洞，该漏洞源于允许任何注册且经过身份验证的用户接受或拒绝任何修订，可能导致用户权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-40869
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V. Comments for CVE-2026-40869
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