Decidim has a cross-site scripting (XSS) in user name
Published: April 13, 2026
SECURITY IDENTIFIERS
- CVE: CVE-2026-23891 (NVD)
- GHSA: GHSA-fc46-r95f-hq7g
- Vendor Advisory: https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g
GEM
PATCHED VERSIONS
~> 0.30.5
>= 0.31.1
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).