cve.bz

CVE-2026-40869

6.5 mediumEPSS 0.2%

Medium (6.5) in decidim decidim. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in decidim-core 0.30.5, 0.31.1.

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).

Severity

CVSS 3.1

6.5 medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS
0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-31)
CWE
CWE-266
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-w5xj-99cg-rccmRubyGemsdecidim-core>=0.31.0.rc1 <0.31.10.31.1
GHSA-w5xj-99cg-rccmRubyGemsdecidim-core>=0.19.0 <0.30.50.30.5

References

Check your stackJSON