Server-Side Request Forgery (SSRF) in draw.io - CVE-2026-76898
Published: August 21, 2026
Vulnerability identifier: #VU144556
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-76898
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform server-side request forgery and disclose sensitive information.
The vulnerability exists due to server-side request forgery in /embed2.js when fetching a user-supplied URL. A remote attacker can send a specially crafted request with an IPv6 ULA target to perform server-side request forgery and disclose sensitive information.
The issue is reachable without authentication via the /embed2.js?fetch= endpoint, and the fetched response is reflected back to the client. On dual-stack hosts, this can expose data from IPv6 ULA-addressed internal services such as instance metadata endpoints.
Affected software
draw.io
How to mitigate CVE-2026-76898
Install security update from vendor's website.
draw.io - update to 31.1.5