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

2026-10-23T03:51:54.786756+00:00

Affected: Bitnami: parse

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.6.0 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 and 8.6.30.

EUVD-2026-275904

2026-10-23T03:51:54.786840+00:00

EUVD-2026-275904

fkie_cve-2026-31868

2026-10-23T03:51:54.786863+00:00

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.

GHSA-v5hf-f4c3-m5rv — Parse Server vulnerable to stored XSS via file upload of HTML-renderable file types

2026-10-23T03:51:54.786933+00:00

Affected: npm: parse-server

### 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