CVE-2026-81303 Hawtio-operator: hawtio-operator: routes/custom-host confused-deputy via spec.routehostname
Namespace users can exploit the Hawtio operator to claim arbitrary hostnames, enabling subdomain takeover and OAuth hijacking.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-81303?
CVE-2026-81303 is a medium-severity missing authorization vulnerability in Red Hat build of Apache Camel - HawtIO 4, published on 15 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A flaw was found in hawtio-operator. The operator holds routes/custom-host:create permission cluster-wide and writes the tenant-supplied spec.routeHostName value from the Hawtio custom resource directly into the Route spec without validation or authorization checks. A namespace edit user, who normally cannot set custom Route hostnames, can use the operator as a confused deputy to claim arbitrary externally-routable hostnames, enabling subdomain takeover and, in combination with the auto-grant OAuthClient, OAuth redirect hijack.
Weakness: CWE-441
Which versions are affected by CVE-2026-81303?
How do I fix CVE-2026-81303?
No fix has been published for CVE-2026-81303 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-81303 being exploited?
There is no known exploitation of CVE-2026-81303 in the wild and no public exploit code.
Sources
Also known as GHSA-mc7v-mpqr-364j.