# CVE-2026-9266: Weak cryptography in UC-1200A Series

> An attacker with physical access can bypass TPM encryption to read LUKS disk keys, compromising encrypted data on Moxa industrial controllers.

- **Severity:** High 7.0 (`CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jun 2026
- **Updated:** 12 Jun 2026
- **Also known as:** GHSA-2j43-x625-hw9q

## What is CVE-2026-9266?

CVE-2026-9266 is a high-severity vulnerability in Moxa UC-1200A Series, published on 12 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A Missing Required Cryptographic Step vulnerability has been identified in Moxa's embedded Linux firmware for industrial computers and controllers. This vulnerability represents an incomplete remediation of CVE-2026-0714. The firmware introduced TPM2 parameter encryption as a countermeasure against CVE-2026-0714. However, an omission in the authorization session configuration causes the parameter encryption to provide no effective protection. An attacker with invasive physical access to the device can still capture TPM communications on the SPI bus and derive the LUKS disk encryption key in plaintext. While successful exploitation results in full compromise of the encrypted disk volume, the attack requires invasive physical access, including opening the device and attaching external equipment to the SPI bus. Remote exploitation is not possible, and the attack does not affect any downstream systems.

Weakness: CWE-325 (Missing Cryptographic Step)

## Which versions are affected by CVE-2026-9266?


## How do I fix CVE-2026-9266?

No fix has been published for CVE-2026-9266 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9266 being exploited?

There is no known exploitation of CVE-2026-9266 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9266 and fix it if it is affected.

What it is: CVE-2026-9266 is a high-severity vulnerability in Moxa UC-1200A Series, published on 12 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-9266 in the wild and no public exploit code.

Affected product: Moxa UC-1200A Series. 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-2026-9266/ (Markdown: https://insights.sbomify.com/CVE-2026-9266/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9266
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9266
- OSV: https://osv.dev/vulnerability/CVE-2026-9266

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9266/
Summaries are generated and may contain mistakes; the official description above is the record.