Cross-site scripting in Parse Server - CVE-2026-30948
Published: April 6, 2026 / Updated: April 7, 2026
Vulnerability identifier: #VU124990
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-30948
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in the victim's browser in the Parse Server origin.
The vulnerability exists due to cross-site scripting in the file upload handling for SVG files when serving uploaded SVG content inline. A remote user can upload a specially crafted SVG file containing JavaScript to execute arbitrary script in the victim's browser in the Parse Server origin.
User interaction is required for a victim to load the uploaded SVG file, and the issue affects deployments where file upload is enabled for authenticated users.
Affected software
Parse Server
How to mitigate CVE-2026-30948
Install security update from vendor's website.
Parse Server - addressed in versions 8.6.17, 9.5.2 alpha.4