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SVGO CVE-2026-73650

| EUVDEUVD-2026-58193 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-08-13 GitHub_M GHSA-2p49-hgcm-8545
XSS Node.js Svgo
8.2
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.2 HIGH
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
vuln.today AI
8.2 HIGH

Network-delivered stored XSS with scope change to victim browser; PR:N as upload endpoints typically require no elevated privilege; victim must open the SVG, so UI:R.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch available
Aug 13, 2026 - 19:04 EUVD
Source Code Evidence Fetched
Aug 13, 2026 - 19:02 vuln.today
Analysis Generated
Aug 13, 2026 - 19:02 vuln.today
CVE Published
Aug 13, 2026 - 18:08 cve.org
HIGH 8.2

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 npm packages depend on svgo (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 1.0.0.

DescriptionCVE.org

SVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 1.0.0 until versions 2.8.3, 3.3.4, and 4.0.2, the removeScripts plugin, named removeScriptElement in versions 1 through 3, can leave executable content in optimized SVGs because it does not remove namespaced or prefixed script elements such as <svg:script> and, in versions 3 and 4, matches JavaScript URIs case sensitively. Applications that process untrusted SVG input with this plugin enabled and serve the result can allow scripts to execute when another user opens the SVG, exposing local storage or cookies. This issue is fixed in versions 2.8.3, 3.3.4, and 4.0.2.

Articles & Coverage 1

News 7 New Node.js Vulnerabilities - 1 Critical, 6 High, 4 With POC Aug 14, 2026

AnalysisAI

Cross-site scripting in SVGO's script-removal plugin exposes web applications that process untrusted SVG uploads to stored XSS attacks across all major version lines from 1.0.0 through 4.0.1. The removeScripts plugin (called removeScriptElement in v1-3) silently passes through namespace-prefixed script elements such as <svg:script> and performs case-sensitive JavaScript URI matching that attackers trivially bypass with mixed-case variants like JavaScript:. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Upload crafted SVG with <svg:script> and mixed-case JavaScript URI
Delivery
Application processes upload with SVGO removeScripts plugin enabled
Exploit
Plugin fails namespace check, leaves script payload intact
Install
Poisoned SVG stored and served by application
C2
Victim user opens SVG in browser on application origin
Execute
Script executes, reads cookies or local storage
Impact
Session data exfiltrated to attacker
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Vulnerability AssessmentAI

Exploitation Three conditions must all be true simultaneously. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.2 score (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N) is technically accurate for the described impact: stored XSS with scope change (S:C) against a victim's browser origin, with high confidentiality impact (C:H) against cookies and session tokens. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted SVG to a web application's file upload endpoint containing both a `<svg:script>alert(document.cookie)</svg:script>` element and a hyperlink with `href="JavaScript:exfil()"`, knowing the application processes uploads with SVGO's removeScripts plugin enabled. SVGO optimizes the file but leaves both payloads intact due to the namespace-blindness and case-sensitivity flaws. …
Remediation Upgrade SVGO to the patched releases: v2.8.3 for consumers on the v2 line (https://github.com/svg/svgo/releases/tag/v2.8.3), v3.3.4 for the v3 line (https://github.com/svg/svgo/releases/tag/v3.3.4), or v4.0.2 for the v4 line (https://github.com/svg/svgo/releases/tag/v4.0.2). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all applications and services using SVGO and document their current versions; disable untrusted SVG upload endpoints if immediate patching is not feasible, and deploy Content Security Policy headers with script-src 'none' to block inline script execution. …

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CVE-2026-73650 vulnerability details – vuln.today
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