# CVE-2026-81303

## Summary

- **CVE ID:** CVE-2026-81303
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N)
- **CWE:** CWE-441
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

No affected products listed.

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-81303)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2524897)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._