CVE-2026-23891

Decidim has a Cross-site scripting (XSS) vulnerability via user name field

Published Apr 13, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-fc46-r95f-hq7g Decidim has a cross-site scripting (XSS) in user name
History
Type Values Removed Values Added
CPEs cpe:2.3:a:decidim:decidim:*:*:*:*:*:ruby:*:*
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Decidim
Decidim decidim
Vendors & Products Decidim
Decidim decidim
Type Values Removed Values Added
Description 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.
Title Decidim has a Cross-site scripting (XSS) vulnerability via user name field
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 9.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Apr 14, 2026, 4:29 PM
Reserved
Jan 16, 2026, 9:02 PM
Status
Analyzed
Published
Apr 13, 2026, 5:16 PM
Modified
Jun 17, 2026, 10:22 AM