CVE-2025-54411 – Discourse Welcome Banner XSS Vulnerability

The following table lists the changes that have been made to the
CVE-2025-54411 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Aug. 19, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 AV:L/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added CWE CWE-79
    Added Reference https://github.com/discourse/discourse/commit/a3374d2850f07444d113216e1d539ee21650dbff
    Added Reference https://github.com/discourse/discourse/security/advisories/GHSA-5mm6-j5vq-6884
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