GHSA-fc46-r95f-hq7g
Decidim has a cross-site scripting (XSS) in user name
Quick fix
GHSA-fc46-r95f-hq7g — decidim-core: upgrade to the fixed version with the command below.
bundle update decidim-coreDetails
### 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](https://octree.ch/) and made by [Secu Labs](https://seculabs.ch/) against Decidim financed by the city of Lausanne (Switzerland).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-23891[ADVISORY]
- https://github.com/decidim/decidim[PACKAGE]
- https://github.com/decidim/decidim/releases/tag/v0.30.5[WEB]
- https://github.com/decidim/decidim/releases/tag/v0.31.1[WEB]
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-core/CVE-2026-23891.yml[WEB]