CVE-2025-54411CWE-79

Discourse welcome banner user name XSS

Low · published August 19, 2025

CVSS v4.0
2.4
EPSS
0%
Percentile
10.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.4 · LOW
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00205 · 10.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2025-08-19T16:41Z
EPSS history
Timeline
  • 19 AUG 16:41Z
    Discourse welcome banner user name XSS
    cvelistv5