# CVE-2026-23944: Arcane allows unauthenticated proxy access to remote environments

> Unauthenticated attackers can access remote Docker environment resources via a proxy middleware flaw, leading to data exposure or unauthorized changes.

- **Severity:** High 8.0 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jan 2026
- **Updated:** 21 Jan 2026
- **Also known as:** GHSA-2jv8-39rp-cqqr

## What is CVE-2026-23944?

CVE-2026-23944 is a high-severity authentication bypass vulnerability in getarcaneapp arcane, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to version 1.13.2, unauthenticated requests could be proxied to remote environment agents, allowing access to remote environment resources without authentication. The environment proxy middleware handled `/api/environments/{id}/...` requests for remote environments before authentication was enforced. When the environment ID was not local, the middleware proxied the request and attached the manager-held agent token, even if the caller was unauthenticated. This enabled unauthenticated access to remote environment operations (e.g., listing containers, streaming logs, or other agent endpoints). An unauthenticated attacker could access and manipulate remote environment resources via the proxy, potentially leading to data exposure, unauthorized changes, or service disruption. Version 1.13.2 patches the vulnerability.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-23944?

It affects 1 product.


Products: Arcane Arcane.

## How do I fix CVE-2026-23944?

No fix has been published for CVE-2026-23944 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23944 being exploited?

There is no known exploitation of CVE-2026-23944 in the wild and no public exploit code.

## Other vulnerabilities in getarcaneapp arcane

- [CVE-2026-23520](https://insights.sbomify.com/CVE-2026-23520/): Arcane has a Command Injection in Arcane Updater Lifecycle Labels Enables RCE (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23944 and fix it if it is affected.

What it is: CVE-2026-23944 is a high-severity authentication bypass vulnerability in getarcaneapp arcane, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23944 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-2026-23944/ (Markdown: https://insights.sbomify.com/CVE-2026-23944/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23944
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23944
- OSV: https://osv.dev/vulnerability/CVE-2026-23944

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23944/
Summaries are generated and may contain mistakes; the official description above is the record.