---
cve: "CVE-2026-76898"
severity: "HIGH"
cvss: 7.7
epss: "20.1%"
vendor: "jgraph"
kev: false
exploited: false
published: "2026-09-21 17:18:50"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T23:19:19+02:00"
---

# CVE-2026-76898

> 7.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 73c4a91196246bbdb60f52b15871e82006b7972d (Commit)

## Referenzen

- <https://github.com/jgraph/drawio/security/advisories/GHSA-m3q9-cwfq-hcjc>
- <https://github.com/jgraph/drawio/commit/73c4a91196246bbdb60f52b15871e82006b7972d>
- <https://github.com/jgraph/drawio/releases/tag/v30.3.8>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-76898) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_