# CVE-2026-86114: Arcane before 2.0.0 Missing Administrator Authorization on the Compose Template Mutation Endpoints

> Attackers with default user roles can modify compose templates to inject malicious configurations, leading to privilege escalation and code execution when deployed by administrators.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-pj2x-fr4j-wrxq

## What is CVE-2026-86114?

CVE-2026-86114 is a high-severity missing authorization vulnerability in getarcaneapp arcane, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Arcane versions before 2.0.0 fail to properly restrict template operations, allowing default user role accounts to create, modify, and delete compose templates including instance-wide defaults. Attackers can inject malicious container configurations with privileged settings or host path mounts that execute with administrative privileges when deployed by administrators.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-86114?


## How do I fix CVE-2026-86114?

No fix has been published for CVE-2026-86114 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86114 being exploited?

There is no known exploitation of CVE-2026-86114 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86114 and fix it if it is affected.

What it is: CVE-2026-86114 is a high-severity missing authorization vulnerability in getarcaneapp arcane, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-86114 in the wild and no public exploit code.

Affected product: getarcaneapp arcane. 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-2026-86114/ (Markdown: https://insights.sbomify.com/CVE-2026-86114/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86114
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86114
- OSV: https://osv.dev/vulnerability/CVE-2026-86114

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86114/
Summaries are generated and may contain mistakes; the official description above is the record.