# CVE-2026-12411: Broken Access Control in Canonical LXD DevLXD API

> An untrusted guest can mount, read, and overwrite another guest's storage volume via a crafted API request when specific management settings are enabled.

- **Severity:** High 8.4 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** GHSA-hhf9-qw4v-72xp

## What is CVE-2026-12411?

CVE-2026-12411 is a high-severity missing authorization vulnerability in Canonical lxd, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest to mount, read, and overwrite another guest's custom storage volume via a crafted device PATCH request over /dev/lxd when security.devlxd.management.volumes is enabled.

Weakness: CWE-862 (Missing Authorization), CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-12411?

It affects 1 product.


Products: Canonical Lxd.

## How do I fix CVE-2026-12411?

No fix has been published for CVE-2026-12411 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12411 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12411 exists.

## Other vulnerabilities in Canonical lxd

- [CVE-2026-66897](https://insights.sbomify.com/CVE-2026-66897/): Instance template path traversal allows arbitrary host file write as root (critical 9.9)
- [CVE-2026-62420](https://insights.sbomify.com/CVE-2026-62420/): Cross-project cluster migration bypasses project restrictions via cluster notification flag (critical 9.9)
- [CVE-2026-63293](https://insights.sbomify.com/CVE-2026-63293/): Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root (critical 9.9)
- [CVE-2026-63294](https://insights.sbomify.com/CVE-2026-63294/): Root RCE via image backup.yaml symlink (critical 9.9)
- [CVE-2026-63296](https://insights.sbomify.com/CVE-2026-63296/): Project restriction bypass via instance migration config override (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12411 and fix it if it is affected.

What it is: CVE-2026-12411 is a high-severity missing authorization vulnerability in Canonical lxd, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12411 exists.

Affected product: Canonical lxd. 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-2026-12411/ (Markdown: https://insights.sbomify.com/CVE-2026-12411/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12411
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12411
- OSV: https://osv.dev/vulnerability/CVE-2026-12411

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12411/
Summaries are generated and may contain mistakes; the official description above is the record.