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CVE-2026-76898— draw.io: Unauthenticated SSRF via IPv6 ULA blocklist bypass in /embed2.js

Quick assessment

Affected
jgraph drawio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 re

CVSS 7.7 · High EPSS 0.28% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
jgraph drawio < 30.3.8 affected
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I. Basic Information for CVE-2026-76898

Vulnerability Information

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Vulnerability Title
draw.io: Unauthenticated SSRF via IPv6 ULA blocklist bypass in /embed2.js
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jgraph drawio < 30.3.8 -

II. Public POCs for CVE-2026-76898

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III. Intelligence Information for CVE-2026-76898

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Other References for CVE-2026-76898 (2)

Same Patch Batch · jgraph · 2026-09-21 · 5 CVEs total

CVE-2026-63334 6.8 MEDIUM draw.io: SSRF via DNS rebinding in ProxyServlet bypasses private IP blocklist
CVE-2026-58504 6.1 MEDIUM draw.io: Stored XSS on file open via editable=0 sibling cell — patch bypass of CVE-2026-46
CVE-2026-63373 4.2 MEDIUM draw.io: OAuth CSRF via missing state validation on self-hosted deployments allows session
CVE-2026-63416 3.7 LOW draw.io: Path traversal in ExportProxyServlet allows access to arbitrary backend endpoints

IV. Related Vulnerabilities

Same product: drawio
Same vendor: jgraph
Same weakness: CWE-918

V. Comments for CVE-2026-76898

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