Decidim has a cross-site scripting (XSS) in user name
GHSA-fc46-r95f-hq7g · CVE-2026-23891
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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).
References
- WEB https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-23891
- PACKAGE https://github.com/decidim/decidim
- WEB 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
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