CVE-2025-54411 — Discourse welcome banner user name XSS
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 adm…
Published: 2025-08-19 · CVSS: 2.4 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7