---
id: "CVE-2026-97373"
kind: "vulnerability"
aliases: ["CVE-2026-97373"]
title: "draw.io: proxy endpoint lets attackers reach internal addresses via SSRF"
severity: "medium"
cvss: 5.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["draw.io", "kubernetes", "package", "self-hosted"]
not_affected_if: ["managed-hosting", "proxy-endpoint-disabled"]
published_at: "2026-11-04T21:18:17+00:00"
first_seen_at: "2026-11-04T21:49:23+00:00"
updated_at: "2026-11-04T21:51:22+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97373", "first_seen_at": "2026-11-04T21:49:23+00:00"}]
exploit_sources: []
---

# draw.io: proxy endpoint lets attackers reach internal addresses via SSRF

draw.io, a diagramming application, has an optional /proxy endpoint whose URL check misses the RFC 6598 shared address range 100.64.0.0/10. An unauthenticated remote attacker can make the draw.io server request internal services in that range and may read the responses.

_Summary, check and fix written by a model from the sources; labelled as such._

## Fix

- Move draw.io to `30.3.8` or later.

## Timeline

- 2026-11-04T21:49:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-97373

## Documents

- [advisory] Vendor advisory: github.com https://github.com/jgraph/drawio/security/advisories/GHSA-xc39-mcq4-fr4q
- [fix] Patch: github.com https://github.com/jgraph/drawio/commit/73c4a91196246bbdb60f52b15871e82006b7972d

## From the sources

draw.io is a configurable diagramming and whiteboarding application. Prior to 30.3.8, the optional /proxy endpoint contains an incomplete server-side request forgery blocklist. When the endpoint is enabled, the URL validator does not reject the RFC 6598 shared address range 100.64.0.0/10. An unauthenticated remote attacker can cause the draw.io server to request internal services that are reachable in this range, potentially disclosing data from Carrier-Grade NAT, Kubernetes, cloud, or overlay-network addresses. This vulnerability is fixed in 30.3.8.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_