# 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


- **Severity:** High 8.3 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 5 Nov 2026
- **Updated:** 10 Nov 2026
- **Also known as:** GHSA-m6c5-5946-f5rx

## 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 (Authentication Bypass by Spoofing)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123033 and fix it if it is affected.

What it is: CVE-2026-123033 is a high-severity vulnerability in iXsystems TrueNAS SCALE, published on 5 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-123033 in the wild and no public exploit code.

Affected product: iXsystems TrueNAS SCALE. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-123033/ (Markdown: https://insights.sbomify.com/CVE-2026-123033/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123033
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123033
- OSV: https://osv.dev/vulnerability/CVE-2026-123033

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-123033/
Summaries are generated and may contain mistakes; the official description above is the record.