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CVE-2026-63334— draw.io: SSRF via DNS rebinding in ProxyServlet bypasses private IP blocklist

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 30.2.7, 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

CVSS 6.8 · Medium EPSS 0.20% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
jgraph drawio < 30.2.7 affected
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I. Basic Information for CVE-2026-63334

Vulnerability Information

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Vulnerability Title
draw.io: SSRF via DNS rebinding in ProxyServlet bypasses private IP blocklist
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A: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 < 30.2.7 -

II. Public POCs for CVE-2026-63334

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III. Intelligence Information for CVE-2026-63334

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Other References for CVE-2026-63334 (2)

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

CVE-2026-76898 7.7 HIGH draw.io: Unauthenticated SSRF via IPv6 ULA blocklist bypass in /embed2.js
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-2026-63334

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