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CVE-2026-31868— Parse Server has Stored XSS via file upload of HTML-renderable file types

Quick assessment

Affected
parse-community parse-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Parse Server是Parse Platform开源的一个开源后端，可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 9.6.0-alpha.4之前版本和8.6.30之前版本存在跨站脚本漏洞，该漏洞源于可上传包含恶意代码的文件，可能导致存储型跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.33% · P24
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I. Basic Information for CVE-2026-31868

Vulnerability Information
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Vulnerability Title
Parse Server has Stored XSS via file upload of HTML-renderable file types
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Server是Parse Platform开源的一个开源后端，可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 9.6.0-alpha.4之前版本和8.6.30之前版本存在跨站脚本漏洞，该漏洞源于可上传包含恶意代码的文件，可能导致存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
parse-community parse-server >= 9.0.0 < 9.6.0-alpha.4 -

II. Public POCs for CVE-2026-31868

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III. Intelligence Information for CVE-2026-31868

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Vendor Advisories for CVE-2026-31868 (1)

Vendor Pages for CVE-2026-31868 (2)

Same Patch Batch · parse-community · 2026-03-11 · 9 CVEs total

CVE-2026-31840 Parse Server has a SQL injection via dot-notation field name in PostgreSQL
CVE-2026-31856 Parse Server has a SQL injection via `Increment` operation on nested object field in Postg
CVE-2026-31872 Parse Server has a protected fields bypass via dot-notation in query and sort
CVE-2026-31871 Parse Server has a SQL Injection via dot-notation sub-key name in `Increment` operation on
CVE-2026-31875 Parse Server MFA recovery codes not consumed after use
CVE-2026-32234 Parse Server has a SQL injection via query field name when using PostgreSQL
CVE-2026-32098 Parse Server has a protected fields bypass via LiveQuery subscription WHERE clause
CVE-2026-31901 Parse Server has user enumeration via email verification endpoint

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-79

V. Comments for CVE-2026-31868

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