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OpenAdvisories
Low · 2.4 CVE-2025-54411 EUVD-2025-25192

Discourse welcome banner user name XSS

Published Aug 19, 2025 · Updated Aug 19, 2025 · Assigned by GitHub_M

Description

Discourse is an open-source discussion platform. Welcome banner user name string for logged in users can be vulnerable to XSS attacks, which affect the user themselves or an admin impersonating them. Admins can temporarily alter the welcome_banner.header.logged_in_members site text to remove the preferred_display_name placeholder, or not impersonate
any users for the time being. This vulnerability is fixed in 3.5.0.beta8.

Affected products

VendorProductAffectedFixed
discourse discourse < 3.5.0.beta8 —

References