CVE-2026-76898 (GCVE-0-2026-76898)
Vulnerability from cvelistv5 – Published: 2026-09-21 16:31 – Updated: 2026-09-24 22:21
VLAI
EPSS
VEX
Title
draw.io: Unauthenticated SSRF via IPv6 ULA blocklist bypass in /embed2.js
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 22:21 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/jgraph/drawio/security/advisor… | x_refsource_CONFIRM |
| https://github.com/jgraph/drawio/commit/73c4a9119… | x_refsource_MISC |
| https://github.com/jgraph/drawio/releases/tag/v30.3.8 | x_refsource_MISC |
Impacted products
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