CVE-2026-123033 Authentication bypass in the HA heartbeat origin check in middlewared in TrueNAS SCALE before 25.10.8 (and in release trains before their re
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123033?
CVE-2026-123033 is a high-severity vulnerability in iXsystems TrueNAS SCALE, published on 5 Nov 2026.
Official description
Authentication bypass in the HA heartbeat origin check in middlewared in TrueNAS SCALE before 25.10.8 (and in release trains before their respective fixes) allows an attacker on the same network segment to achieve unauthenticated full-administrator API access and execute commands as root. middlewared registers the HA peer-authentication hook (ha_permission) unconditionally, with no failover-licence or heartbeat-interface check. An unauthenticated connection whose TCP peer address is a hardcoded HA heartbeat address (169.254.10.1 or 169.254.10.2) and whose peer port is <= 1024 is granted a node credential that is authorized for every API method and treated as full administrator. Both conditions are properties of the attacker's own socket, and thus an attacker on the same layer-2 segment satisfies them without forging anything. The hook is present on non-HA, unlicensed, single-node Community Edition installations. The fix additionally requires that the connection terminate on the HA heartbeat listener (a local address/port the attacker cannot control).
Weakness: CWE-290
Which versions are affected by CVE-2026-123033?
How do I fix CVE-2026-123033?
No fix has been published for CVE-2026-123033 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123033 being exploited?
There is no known exploitation of CVE-2026-123033 in the wild and no public exploit code.
Sources
Also known as GHSA-m6c5-5946-f5rx.