Launch Week Day 1: Announcing Security Design Review
HIGH 8.7 RubyGems

Decidim has a cross-site scripting (XSS) in user name

GHSA-fc46-r95f-hq7g · CVE-2026-23891

Published · Modified

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).

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