GHSA-hcj7-6gxh-24ww

Source

https://github.com/advisories/GHSA-hcj7-6gxh-24ww

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-hcj7-6gxh-24ww/GHSA-hcj7-6gxh-24ww.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-hcj7-6gxh-24ww

Aliases

Published

2026-03-11T00:17:35Z

Modified

2026-03-14T03:41:06Z

Severity

8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N CVSS Calculator

Summary

Parse Server vulnerable to stored cross-site scripting (XSS) via SVG file upload

Details

Impact

A stored cross-site scripting (XSS) vulnerability allows any authenticated user to upload an SVG file containing JavaScript. The file is served inline with Content-Type: image/svg+xml and without protective headers, causing the browser to execute embedded scripts in the Parse Server origin. This can be exploited to steal session tokens from localStorage and achieve account takeover.

The default fileExtensions option blocks HTML file extensions but does not block SVG, which is a well-known XSS vector. All Parse Server deployments where file upload is enabled for authenticated users (the default) are affected.

Patches

The fix adds svg (case-insensitive) to the default file extension denylist. The default regex changes from ^(?![xXsS]?[hH][tT][mM][lL]?$) to ^(?!([xXsS]?[hH][tT][mM][lL]?|[sS][vV][gG])$).

Workarounds

Configure the fileExtensions option to explicitly block SVG uploads:

{
  fileUpload: {
    fileExtensions: ['^(?!([xXsS]?[hH][tT][mM][lL]?|[sS][vV][gG])$)']
  }
}

References

GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-hcj7-6gxh-24ww
Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.4
Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.17

Database specific

{
    "cwe_ids":  [
        "CWE-79"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-03-11T00:17:35Z",
    "nvd_published_at":  "2026-03-10T21:16:47Z",
    "severity":  "HIGH"
}

References

Affected packages

npm / parse-server

Package

Name: parse-server; View open source insights on deps.dev
Purl: pkg:npm/parse-server

Affected ranges

Type: SEMVER
Events: Introduced

9.0.0

Fixed

9.5.2-alpha.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-hcj7-6gxh-24ww/GHSA-hcj7-6gxh-24ww.json"

npm / parse-server

Package

Name: parse-server; View open source insights on deps.dev
Purl: pkg:npm/parse-server

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.6.17

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-hcj7-6gxh-24ww/GHSA-hcj7-6gxh-24ww.json"