GitHub Advisoryadvisory · RubyGems

GHSA-fc46-r95f-hq7g Decidim has a cross-site scripting (XSS) in user name

CRITICAL Published 2026-04-13 Modified 2026-05-13 Official page ↗
Aliases
CVE-2026-23891
Ecosystem
RubyGems
Packages
decidim-core
Severity
Critical
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Weaknesses
CWE-79
Reviewed
2026-04-13

Affected packages

• RubyGems decidim-core: >= 0.31.0.rc1, < 0.31.1 → fixed in 0.31.1 • RubyGems decidim-core: < 0.30.5 → fixed in 0.30.5

Description

Impact 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. Patches N/A Workarounds Not available References OWASP ASVS v4.0.3-5.1.3 Credits This issue was discovered in a security audit organized by octree and made by Secu Labs against Decidim financed by the city of Lausanne (Switzerland).

Related

Alias · CVE (1)

  • CVE-2026-23891 Decidim is a participatory democracy framework. vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References