CVE-2026-30948

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

HIGH 8.3

At a glance

Source: NVD
EPSS: EPSS 0.22 % · percentile 13 (2026-10-28)
State: PUBLISHED
Published: 2026-03-10 20:18 UTC
Updated: 2026-03-10 20:41 UTC
Assigner: GitHub_M
NVD status: Analyzed

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.

Weaknesses (CWE)

CWE-79 — Cross-site Scripting (XSS)

References

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 8.3	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	GitHub_M
CVSS 4.0	HIGH 8.3	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	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	MEDIUM 5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	NVD · nvd@nist.gov (Primary)

Advisories

GHSA-hcj7-6gxh-24ww — Parse Server vulnerable to stored cross-site scripting (XSS) via SVG file upload

European references

ENISA EUVD · EUVD-2026-10866
GCVE · GCVE-0-2026-30948

Affected configurations (NVD CPE)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* < 8.6.17
cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* ≥ 9.0.0 < 9.5.2
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha2:*:*:*:node.js:*:*
cpe:2.3:a:parseplatform:parse-server:9.5.2:alpha3:*:*:*:node.js:*:*

Affected products

Product	Versions
parse-community · parse-server	affected >= 9.0.0 < 9.5.2-alpha.4 ; affected < 8.6.17

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD