jgraph draw.io up to 30.2.6 Proxy Servlet Utils.java Utils.sanitizeUrl server-side request forgery

Summaryinfo

A vulnerability was found in jgraph draw.io up to 30.2.6. It has been classified as problematic. This impacts the function Utils.sanitizeUrl of the file src/main/java/com/mxgraph/online/Utils.java of the component Proxy Servlet. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-63334. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in jgraph draw.io up to 30.2.6. It has been declared as problematic. Affected by this vulnerability is the function Utils.sanitizeUrl of the file src/main/java/com/mxgraph/online/Utils.java of the component Proxy Servlet. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. The summary by CVE is:

draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.7, deployments with ENABLE_DRAWIO_PROXY=1 are vulnerable to server-side request forgery because src/main/java/com/mxgraph/online/Utils.java performs the private-address check in Utils.sanitizeUrl() using one DNS resolution, while src/main/java/com/mxgraph/online/ProxyServlet.java later calls URL.openConnection() and performs a second resolution. An attacker-controlled hostname can resolve to a public address during validation and then to a private, link-local, or cloud metadata address when the connection is opened. Successful exploitation can return cloud instance metadata or responses from internal HTTP services through the proxy. This issue is fixed in version 30.2.7.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-63334 since 07/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 30.2.7 eliminates this vulnerability.

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Productinfo

Vendor

• jgraph

Name

• draw.io

Version

• 30.2.0
• 30.2.1
• 30.2.2
• 30.2.3
• 30.2.4
• 30.2.5
• 30.2.6

License

• open-source

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