# CVE-2026-123033: CVE-2026-123033

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

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).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- iXsystems / TrueNAS SCALE: ≥ 0; < 25.10.8 (affected, custom). Source: CNA: mitre

## Severity and prioritization

- CVSS 3.1: 8.3 (high); CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H; source: CNA: mitre

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-290

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://security.truenas.com/scale/impact-statements/ha-node-auth-bypass/ (CNA: mitre)

## Provenance

- CNA: mitre: https://www.cve.org/CVERecord?id=CVE-2026-123033; retrieved 2026-11-05; source updated 2026-11-05

Revision: 2356c67f2af64a2036b8a62faaa4ecdf8c7b0b2199d9f631d3b8a8374316271f

Canonical: https://y2.dev/cve/CVE-2026-123033

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