CVE-2025-54411
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product
Discourse
PublishedAug 19, 2025
First seenAug 19, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- discourse discourse3.5.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| discourse discourse | v < 3.5.0, 3.5.0 | 3.5.0 |
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