CVE-2026-23891

critical · 9.3

Decidim is a participatory democracy framework. In versions below 0.30.5 and 0.31.0.rc1 through 0.31.0, a stored code execution vulnerability in the user name field allows a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page, resulting in high confidentiality and integrity impact across security boundaries. This issue has been fixed in versions 0.30.5 and 0.31.1.

9.3

CVSS

0.4%

EPSS (exploit prob.)

29th

EPSS percentile

2026-04-13

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-79

Affected products

Vendor	Product	Affected versions
decidim	decidim	< 0.30.5
decidim	decidim	>= 0.31.0, < 0.31.1

Check a specific version with /api/v1/cve/match.

References

https://github.com/decidim/decidim/releases/tag/v0.30.5
https://github.com/decidim/decidim/releases/tag/v0.31.1
https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-23891