SVGO up to 2.8.3/3.3.4/4.0.x removeScripts plugins/removeScripts.js cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in SVGO up to 2.8.3/3.3.4/4.0.x. This affects an unknown function of the file plugins/removeScripts.js of the component removeScripts. This manipulation causes cross site scripting. This vulnerability is tracked as CVE-2026-84370. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in SVGO up to 2.8.3/3.3.4/4.0.x and classified as problematic. Affected by this vulnerability is an unknown functionality of the file plugins/removeScripts.js of the component removeScripts. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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, incompletely filters executable links in plugins/removeScripts.js and lib/svgo/tools.js. The plugin does not recognize namespace-prefixed SVG anchor elements such as svg:a with href or namespaced *:href values, and it does not remove ASCII tab, line-feed, or carriage-return characters before checking URL schemes. Browsers remove those characters before parsing a scheme, allowing an executable link to pass the plugin's check. When an application processes attacker-controlled SVG input and serves the result in an active browser context, a victim who activates the surviving link can execute script in the SVG'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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-84370 since 09/01/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 2.8.4, 3.3.5 or 4.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-69653). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• SVGO

Version

• 2.8.0
• 2.8.1
• 2.8.2
• 2.8.3
• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 4.0

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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