Information disclosure in draw.io - #VU144557
Published: August 21, 2026
Vulnerability identifier: #VU144557
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper neutralization of external references in Graph.isStyleAllowed when processing CSS in diagram labels. A remote attacker can supply a crafted diagram that triggers external image requests and conditional CSS-based data leakage to disclose sensitive information.
User interaction is required to view a crafted diagram, and the issue is particularly exposed when untrusted diagrams are rendered inline via GraphViewer in a page that contains DOM secrets.
Affected software
draw.io
Remediation
Install security update from vendor's website.
draw.io - update to 31.3.1