Server-Side Request Forgery (SSRF) in draw.io - #VU144555
Published: August 21, 2026
Vulnerability identifier: #VU144555
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to send server-side requests to internal CGNAT hosts.
The vulnerability exists due to improper input validation in ProxyServlet / Utils.sanitizeUrl when handling requests to the optional /proxy endpoint. A remote attacker can send a specially crafted request to send server-side requests to internal CGNAT hosts.
Only instances with ENABLE_DRAWIO_PROXY=1 are vulnerable.
Affected software
draw.io
Remediation
Install security update from vendor's website.
draw.io - update to 30.3.8