kepano defuddle up to 0.8.x src/defuddle.ts _findContentBySchemaText cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in kepano defuddle up to 0.8.x. Affected by this issue is the function _findContentBySchemaText of the file src/defuddle.ts. This manipulation causes cross site scripting. This vulnerability appears as CVE-2026-30830. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in kepano defuddle up to 0.8.x. It has been declared as problematic. Affected by this vulnerability is the function _findContentBySchemaText of the file src/defuddle.ts. 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:

Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a " in the alt attribute to break out of the attribute context and inject event handler. This issue has been patched in version 0.9.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-30830 since 03/05/2026. 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 0.9.0 eliminates this vulnerability. Applying the patch f154cb740ee603431b69638273af737a27156df9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• kepano

Name

• defuddle

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8

License

• open-source

Website

• Product: https://github.com/kepano/defuddle/

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