CVE-2025-54411

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 v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/discourse/discourse/commit/a3374d2850f07444d113216e1d539ee21650dbff	Patch
https://github.com/discourse/discourse/security/advisories/GHSA-5mm6-j5vq-6884	Third Party Advisory Mitigation

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:discourse:discourse:::::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta1:::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta2:::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta3:::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta4:::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta5:::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta6:::beta:::*
	cpe:2.3:a:discourse:discourse:3.5.0:beta7:::beta:::*

History

No history.

Information

Published : 2025-08-19 17:15

Updated : 2025-08-25 18:25

NVD link : CVE-2025-54411

Mitre link : CVE-2025-54411

CVE.ORG link : CVE-2025-54411

JSON object : View

Products Affected

discourse

discourse

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2025-54411", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.3}], "cvssMetricV40": [{"type": "Secondary", "source": "[email protected]", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 2.4, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "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/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2025-08-19T17:15:40.833", "references": [{"url": "https://github.com/discourse/discourse/commit/a3374d2850f07444d113216e1d539ee21650dbff", "tags": ["Patch"], "source": "[email protected]"}, {"url": "https://github.com/discourse/discourse/security/advisories/GHSA-5mm6-j5vq-6884", "tags": ["Third Party Advisory", "Mitigation"], "source": "[email protected]"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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\nany users for the time being. This vulnerability is fixed in 3.5.0.beta8."}, {"lang": "es", "value": "Discourse es una plataforma de discusi\u00f3n de c\u00f3digo abierto. El nombre de usuario del banner de bienvenida para usuarios registrados puede ser vulnerable a ataques XSS, que afectan al usuario o a un administrador que se hace pasar por \u00e9l. Los administradores pueden modificar temporalmente el texto del sitio welcome_banner.header.logged_in_members para eliminar el marcador de posici\u00f3n preferred_display_name o no suplantar a ning\u00fan usuario por el momento. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 3.5.0.beta8."}], "lastModified": "2025-08-25T18:25:52.673", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "A0A6583A-A8AE-4C05-8947-79A0E4A73E1D", "versionEndExcluding": "3.5.0"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta1:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "66931995-F794-48F0-9DBB-9048B6C9D8DD"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta2:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "B0461B93-273C-4305-80F9-C70A100B4DFE"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta3:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "F1596D4E-FD8B-4443-AAAE-1D4AC6B1CE6D"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta4:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "997761D0-A8A1-438F-83DE-5E9E4890CEED"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta5:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "685B6537-929A-4DC9-8984-E114C5CB6E77"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta6:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "D9D71C7F-CDE7-41DE-84DF-ACE62AD829B2"}, {"criteria": "cpe:2.3:a:discourse:discourse:3.5.0:beta7:*:*:beta:*:*:*", "vulnerable": true, "matchCriteriaId": "7406D79F-ADD6-4AA6-95C9-7CC3EB19DFC8"}], "operator": "OR"}]}], "sourceIdentifier": "[email protected]"}