CVE-2026-31868

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0-alpha.4 and 8.6.30, an attacker can upload a file with a file extension or content type that is not blocked by the default configuration of the Parse Server fileUpload.fileExtensions option. The file can contain malicious code, for example JavaScript in an SVG or XHTML file. When the file is accessed via its URL, the browser renders the file and executes the malicious code in the context of the Parse Server domain. This is a stored Cross-Site Scripting (XSS) vulnerability that can be exploited to steal session tokens, redirect users, or perform actions on behalf of other users. Affected file extensions and content types include .svgz, .xht, .xml, .xsl, .xslt, and content types application/xhtml+xml and application/xslt+xml for extensionless uploads. Uploading of .html, .htm, .shtml, .xhtml, and .svg files was already blocked. This vulnerability is fixed in 9.6.0-alpha.4 and 8.6.30.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/parse-community/parse-server/releases/tag/8.6.30	Product Release Notes
https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.4	Product Release Notes
https://github.com/parse-community/parse-server/security/advisories/GHSA-v5hf-f4c3-m5rv	Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:parseplatform:parse-server::::::node.js::*
	cpe:2.3:a:parseplatform:parse-server::::::node.js::*
	cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha1::::node.js::*
	cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha2::::node.js::*
	cpe:2.3:a:parseplatform:parse-server:9.6.0:alpha3::::node.js::*

History

No history.

Information

Published : 2026-03-11 18:16

Updated : 2026-03-13 18:25

NVD link : CVE-2026-31868

Mitre link : CVE-2026-31868

CVE.ORG link : CVE-2026-31868

JSON object : View

Products Affected

parseplatform

parse-server

CWE

CWE-79

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

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This vulnerability is fixed in 9.6.0-alpha.4 and 8.6.30."}, {"lang": "es", "value": "Parse Server es un backend de c\u00f3digo abierto que puede implementarse en cualquier infraestructura que pueda ejecutar Node.js. Antes de 9.6.0-alpha.4 y 8.6.30, un atacante puede subir un archivo con una extensi\u00f3n de archivo o tipo de contenido que no est\u00e1 bloqueado por la configuraci\u00f3n predeterminada de la opci\u00f3n fileUpload.fileExtensions de Parse Server. El archivo puede contener c\u00f3digo malicioso, por ejemplo JavaScript en un archivo SVG o XHTML. Cuando se accede al archivo a trav\u00e9s de su URL, el navegador renderiza el archivo y ejecuta el c\u00f3digo malicioso en el contexto del dominio de Parse Server. Esta es una vulnerabilidad de cross-site scripting (XSS) almacenado que puede ser explotada para robar tokens de sesi\u00f3n, redirigir usuarios o realizar acciones en nombre de otros usuarios. Las extensiones de archivo y tipos de contenido afectados incluyen .svgz, .xht, .xml, .xsl, .xslt, y los tipos de contenido application/xhtml+xml y application/xslt+xml para subidas sin extensi\u00f3n. La subida de archivos .html, .htm, .shtml, .xhtml y .svg ya estaba bloqueada. 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