Cross-site scripting in Parse Server - CVE-2026-31868
Published: April 6, 2026 / Updated: April 7, 2026
Vulnerability identifier: #VU124994
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-31868
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script in a user's browser in the context of the Parse Server domain.
The vulnerability exists due to cross-site scripting in the file upload handling functionality when processing uploaded HTML-renderable file types and serving them via their URL. A remote attacker can upload a specially crafted file containing malicious script to execute arbitrary script in a user's browser in the context of the Parse Server domain.
User interaction is required to access the uploaded file URL.
Affected software
Parse Server
How to mitigate CVE-2026-31868
Install security update from vendor's website.
Parse Server - addressed in versions 8.6.30, 9.6.0 alpha.4