Medium severity · published Aug 19, 2025
CVE-2025-54411
Discourse is an open-source discussion platform
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
Discourse · Discourse
before 3.5.0; 3.5.0; 3.5.0; 3.5.0; 3.5.0; 3.5.0; +2 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-54411
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-54411
Patch
https://github.com/discourse/discourse/commit/a3374d2850f07444d113216e1d539ee21650dbff
Mitigation
https://github.com/discourse/discourse/security/advisories/GHSA-5mm6-j5vq-6884
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