Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/jgraph/drawio/commit/650fbd742814f6502f78248dc2d8e2aaa5e42b5e
- https://github.com/jgraph/drawio/releases/tag/v30.2.7
- https://github.com/jgraph/drawio/security/advisories/GHSA-3v4h-8r2c-m8c5
FAQ
What is CVE-2026-63334?
CVE-2026-63334 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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...
How severe is CVE-2026-63334?
CVE-2026-63334 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63334?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.