CVE-2026-76898

draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.3.8, src/main/java/com/mxgraph/online/Utils.java checks IPv6 Unique Local Addresses in Utils.sanitizeUrl() by comparing the text prefixes fc00:: and fd00::, but the JDK returns the expanded address form, so the fc00::/7 range, including the AWS metadata range fd00:ec2::/32, is not blocked. An unauthenticated request to /embed2.js?fetch= can therefore make src/main/java/com/mxgraph/online/EmbedServlet2.java fetch an IPv6 ULA internal resource and reflect the response to the requester. Utils.validatedAddress() uses the same private-address check for the separate ProxyServlet path, which requires ENABLE_DRAWIO_PROXY=1. The primary /embed2.js path requires no proxy feature flag or DNS rebinding, and it can disclose cloud metadata credentials or data from other IPv6-reachable internal services. This issue is fixed in version 30.3.8.

CVSS

No CVSS.

References

Link	Resource
https://github.com/jgraph/drawio/commit/73c4a91196246bbdb60f52b15871e82006b7972d
https://github.com/jgraph/drawio/releases/tag/v30.3.8
https://github.com/jgraph/drawio/security/advisories/GHSA-m3q9-cwfq-hcjc
https://github.com/jgraph/drawio/security/advisories/GHSA-m3q9-cwfq-hcjc

Configurations

No configuration.

History

24 Sep 2026, 23:18

Type	Values Removed	Values Added
References	~~() https://github.com/jgraph/drawio/security/advisories/GHSA-m3q9-cwfq-hcjc -~~	() https://github.com/jgraph/drawio/security/advisories/GHSA-m3q9-cwfq-hcjc -

21 Sep 2026, 17:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-21 17:18

Updated : 2026-09-24 23:18

NVD link : CVE-2026-76898

Mitre link : CVE-2026-76898

CVE.ORG link : CVE-2026-76898

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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