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7.8
Parse Server allows attackers to steal session tokens via SVG file upload
CVE-2026-30948
GHSA-hcj7-6gxh-24ww
GHSA-hcj7-6gxh-24ww
Summary
Parse Server has a security weakness that lets attackers upload a special kind of file that can steal user session information. If you're using Parse Server and allow users to upload files, you need to update your server to fix this issue. Update to the latest version or add custom file extension blocking to protect your users.
What to do
- Update parse-server to version 9.5.2-alpha.4.
- Update parse-server to version 8.6.17.
- Update parse to version 9.5.2.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | parse-server | > 9.0.0 , <= 9.5.2-alpha.4 | 9.5.2-alpha.4 |
| – | parse-server | <= 8.6.17 | 8.6.17 |
| parseplatform | parse-server | <= 8.6.17 | – |
| parseplatform | parse-server | > 9.0.0 , <= 9.5.2 | – |
| parseplatform | parse-server | 9.5.2 | – |
| parseplatform | parse-server | 9.5.2 | – |
| parseplatform | parse-server | 9.5.2 | – |
| – | parse | > 9.0.0 , <= 9.5.2 | 9.5.2 |
Original title
Parse Server has stored cross-site scripting (XSS) via SVG file upload
Original description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.4 and 8.6.17, 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. This vulnerability is fixed in 9.5.2-alpha.4 and 8.6.17.
nvd CVSS4.0
8.3
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
- https://github.com/parse-community/parse-server/releases/tag/8.6.17
- https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.4
- https://github.com/parse-community/parse-server/security/advisories/GHSA-hcj7-6g...
- https://nvd.nist.gov/vuln/detail/CVE-2026-30948
- https://github.com/advisories/GHSA-hcj7-6gxh-24ww
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30948... Vendor Advisory
- https://github.com/parse-community/parse-server Product
Published: 11 Mar 2026 · Updated: 14 Mar 2026 · First seen: 10 Mar 2026