CVE-2026-40869
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
decidim-coreRubyGems | >= 0.31.0.rc1, < 0.31.1 | 0.31.1 |
decidim-coreRubyGems | >= 0.19.0, < 0.30.5 | 0.30.5 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/decidim/decidim/commit/1b99136a1c7aa02616a0b54a6ab88d12907a57a9nvdPatchWEB
- github.com/advisories/GHSA-w5xj-99cg-rccmghsaADVISORY
- github.com/decidim/decidim/security/advisories/GHSA-w5xj-99cg-rccmnvdMitigationVendor AdvisoryPatchWEB
- nvd.nist.gov/vuln/detail/CVE-2026-40869ghsaADVISORY
- github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2026-40869.ymlghsaWEB
News mentions
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