CVE-2026-63416 draw.io: Path traversal in ExportProxyServlet allows access to arbitrary backend endpoints
Unauthenticated attackers can use path traversal in the ExportProxyServlet to access internal backend endpoints and inject headers, potentially exposing sensitive configuration or administrative functions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63416?
CVE-2026-63416 is a low-severity path traversal vulnerability in jgraph drawio, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.7, src/main/java/com/mxgraph/online/ExportProxyServlet.java uses request.getPathInfo() to build a proxyPath and appends it directly to EXPORT_URL without rejecting dot segments or confirming that the normalized destination remains under the configured export path. An unauthenticated request containing traversal segments can therefore address unintended routes on the internal export server, and the servlet forwards all request headers and the request body to that destination, allowing arbitrary header injection. Depending on the export service configuration, exploitation can expose administration, debugging, health, or configuration endpoints and can permit unintended internal actions. This issue is fixed in version 30.2.7.
Weakness: CWE-22
Which versions are affected by CVE-2026-63416?
How do I fix CVE-2026-63416?
No fix has been published for CVE-2026-63416 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-63416 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63416 exists.
Sources
Also known as GHSA-3pq9-9hg4-ggfw.