SVGO: removeScripts incompletely sanitizes executable HTML in SVG foreignObject elements

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84369
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 21:18:48 UTC
Updated2026-09-02 16:17:28 UTC
DescriptionSVGO, short for SVG Optimizer, is a Node.js library and command-line application for optimizing SVG files. From version 1.0.0 until versions 2.8.4, 3.3.5, and 4.1.0, the opt-in removeScripts plugin, named removeScriptElement in versions 2 and 3 and implemented in plugins/removeScripts.js, removes SVG and XHTML script elements but does not inspect executable HTML content inside SVG foreignObject elements. Event-handler attributes such as onload and onbeforetoggle, srcdoc documents, and executable URLs in the action, data, formaction, href, and src attributes can remain in attacker-controlled SVG input. When an application uses the plugin as its only protection and serves the optimized SVG in an active browser context, the payload can execute script in the viewer's origin, expose data, modify content, or perform actions as the victim. This issue is fixed in versions 2.8.4, 3.3.5, and 4.1.0.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Svg Svgo affected >= 1.0.0, < 2.8.4 Not specified
CNA Svg Svgo affected >= 3.0.0, < 3.3.5 Not specified
CNA Svg Svgo affected >= 4.0.0, < 4.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/svg/svgo/pull/2264 [email protected] github.com
github.com/svg/svgo/commit/0557385564a5c6c11d76cd934a6cff94451e532c [email protected] github.com
github.com/svg/svgo/commit/fd51e474a300417d9361d9302d596b1763146327 [email protected] github.com
github.com/svg/svgo/pull/2272 [email protected] github.com
github.com/svg/svgo/releases/tag/v4.1.0 [email protected] github.com
github.com/svg/svgo/pull/2269 [email protected] github.com
github.com/svg/svgo/commit/994a9f00d79ddec68ce19a1ce9eb8ca08d747e4f [email protected] github.com
github.com/svg/svgo/releases/tag/v3.3.5 [email protected] github.com
github.com/svg/svgo/security/advisories/GHSA-4vpr-x523-8j87 [email protected] github.com
github.com/svg/svgo/releases/tag/v2.8.4 [email protected] github.com
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