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CVE

CVE-2026-30948

Parse Server has stored cross-site scripting (XSS) via SVG file upload
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CVE

CVE-2026-30948

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.3
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
7.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Related Resources

No items found.

References

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/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30948.json, https://github.com/parse-community/parse-server/security/advisories/GHSA-hcj7-6gxh-24ww, https://nvd.nist.gov/vuln/detail/CVE-2026-30948

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00021%
EPSS Percentile
0.06067%
Introduced Version
0
Fix Available
e21214182981e0cd96423cbddcf25f0a99e9479a

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