Parse Server vulnerable to stored XSS via file upload of HTML-renderable file types
Impact
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.
Patches
The fix adds the missing file extensions and content types to the default value of the fileUpload.fileExtensions server option.
Workarounds
Configure the fileUpload.fileExtensions server option to block the affected file extensions and content types.
References
- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-v5hf-f4c3-m5rv
- Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.4
- Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.30
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | parse-server | >= 9.0.0-alpha.1, < 9.6.0-alpha.4, < 8.6.30 | 9.6.0-alpha.4, 8.6.30 |
Referencias
- https://github.com/parse-community/parse-server/security/advisories/GHSA-v5hf-f4c3-m5rv
- https://nvd.nist.gov/vuln/detail/CVE-2026-31868
- https://github.com/parse-community/parse-server
- https://github.com/parse-community/parse-server/releases/tag/8.6.30
- https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.4
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N- Debilidad (CWE)
CWE-79- Plataforma
- npm
- Paquete
parse-server- Publicada
- 11.03.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-v5hf-f4c3-m5rv - CC BY 4.0
Historial de vulnerabilidades: parse-server
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 116
- Primera → última
- 06.2019 06.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 17
- Alta 49
- Media 40
- Baja 10
Divulgaciones por año
- 2019: 2
- 2020: 4
- 2021: 4
- 2022: 12
- 2023: 5
- 2024: 4
- 2025: 6
- 2026: 79
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Parse Server vulnerable to stored XSS via file upload of HTML-renderable file types esta entrada
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