CVE-2026-63334

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 v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
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

Configurations

No configuration.

History

21 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-21 17:17

Updated : 2026-09-23 18:26

NVD link : CVE-2026-63334

Mitre link : CVE-2026-63334

CVE.ORG link : CVE-2026-63334

JSON object : View

Products Affected

No product.

CWE

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-918

Server-Side Request Forgery (SSRF)

{"id": "CVE-2026-63334", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63334", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-21T18:53:51.178568Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 4.0, "exploitabilityScore": 2.2}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "jgraph", "product": "drawio", "versions": [{"status": "affected", "version": "< 30.2.7"}]}]}], "published": "2026-09-21T17:17:39.220", "references": [{"url": "https://github.com/jgraph/drawio/commit/650fbd742814f6502f78248dc2d8e2aaa5e42b5e", "source": "security-advisories@github.com"}, {"url": "https://github.com/jgraph/drawio/releases/tag/v30.2.7", "source": "security-advisories@github.com"}, {"url": "https://github.com/jgraph/drawio/security/advisories/GHSA-3v4h-8r2c-m8c5", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-367"}, {"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-23T18:26:49.087", "sourceIdentifier": "security-advisories@github.com"}