CVE-2026-31868 Details
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.
A stored Cross-Site Scripting (XSS) vulnerability has been identified in Parse Server versions prior to 9.6.0-alpha.4 and 8.6.30. The issue arises from the file upload feature, which allows attackers to upload files with certain extensions or content types that are not blocked by default. Malicious code can be embedded in these files, such as JavaScript in SVG or XHTML formats. Once uploaded, the files can be accessed through their URLs, where the browser will render them and execute the embedded code within the context of the Parse Server domain. This vulnerability could be exploited to steal session tokens, redirect users, or perform actions on behalf of other users.
Users can upgrade to Parse Server versions 9.6.0-alpha.4 or 8.6.30, both of which include the necessary fix. Alternatively, the `fileUpload.fileExtensions` server option can be configured to block the affected file types and content types.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 12, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/parse-community/parse-server/releases/tag/8.6.30 | [email protected] | ProductRelease Notes |
| https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.4 | [email protected] | ProductRelease Notes |
| https://github.com/parse-community/parse-server/security/advisories/GHSA-v5hf-f4c3-m5rv | [email protected] | MitigationPatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| parseplatform parse-server | < 8.6.30 >= 9.0.0, < 9.6.0 9.6.0 alpha1 9.6.0 alpha2 9.6.0 alpha3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 13, 2026 | Initial Analysis | [email protected] |
| Mar 11, 2026 | New CVE Received | [email protected] |