Is CVE-2026-40869 in the CISA KEV catalog?

No. CVE-2026-40869 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40869?

CVE-2026-40869 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-40869?

CVE-2026-40869 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40869?

Upgrade decidim to 0.31.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-40869

HIGH

7.5

CVSS v3

NVD

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).

CWE-266

How to fix

Remediation Available

decidimNVD

Affected:>= 0.31.0, < 0.31.1Fixed in:0.31.1CVE-2026-40869derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Patch2

Related Vulnerabilities

Other CWE-266 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-28000	Critical	9.8	68%	-	Fix
CVE-2025-27007	Critical	9.8	51%	-	-
CVE-2025-47539	Critical	9.8	31%	-	Fix
CVE-2022-20759	High	8.8	28%	-	Fix
CVE-2024-13106	Medium	5.3	27%	-	-
CVE-2024-3013	Medium	6.3	23%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.