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CVE-2026-30948

HIGH CVSS 4.0: 8.3 EPSS 0.01%
Updated Mar 10, 2026
Parse
Parameter Value
CVSS 8.3 (HIGH)
Fixed In 9.5.2
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Parse
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v4.0

Weakness Type (CWE)

CWE-79 Cross-Site Scripting (XSS)

References 3

https://github.com/parse-community/parse-server/releases/tag/8.6.17
security-advisories@github.com
https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.4
security-advisories@github.com
https://github.com/parse-community/parse-server/security/advisories/GHSA-hcj7-6…
security-advisories@github.com
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