# CVE-2026-40139: Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access

> Unauthenticated attackers can bypass access controls to gain unauthorized access to the appliance, including elevated privileges, if specific authentication settings are enabled.

- **Severity:** Critical 9.2 (`CVSS:4.0/AV:N/AC:L/AT:P/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Jul 2026
- **Updated:** 7 Jul 2026
- **Also known as:** GHSA-5wv8-v74x-qrjc

## What is CVE-2026-40139?

CVE-2026-40139 is a critical authentication bypass vulnerability in BeyondTrust Privileged Remote Access, published on 6 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote attacker to bypass access controls and gain unauthorized access to the appliance, including accounts with elevated privileges. Exploitation requires a specific authentication configuration to be enabled.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-40139?

It affects 2 products.


Products: Beyondtrust Privileged Remote Access, Beyondtrust Remote Support.

## How do I fix CVE-2026-40139?

No fix has been published for CVE-2026-40139 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40139 being exploited?

There is no known exploitation of CVE-2026-40139 in the wild and no public exploit code.

## Other vulnerabilities in BeyondTrust Privileged Remote Access

- [CVE-2026-1731](https://insights.sbomify.com/CVE-2026-1731/): BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) OS Command Injection (critical 9.9, exploited in the wild)
- [CVE-2024-12356](https://insights.sbomify.com/CVE-2024-12356/): BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS) Command Injection Vulnerability (critical 9.8, exploited in the wild)
- [CVE-2024-12686](https://insights.sbomify.com/CVE-2024-12686/): BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS) OS Command Injection (medium 6.6, exploited in the wild)
- [CVE-2023-4310](https://insights.sbomify.com/CVE-2023-4310/): Command injection in Privileged Remote Access (PRA) (critical 9.8)
- [CVE-2026-40138](https://insights.sbomify.com/CVE-2026-40138/): Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40139 and fix it if it is affected.

What it is: CVE-2026-40139 is a critical authentication bypass vulnerability in BeyondTrust Privileged Remote Access, published on 6 Jul 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-2026-40139 in the wild and no public exploit code.

Affected product: BeyondTrust Privileged Remote Access. 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-2026-40139/ (Markdown: https://insights.sbomify.com/CVE-2026-40139/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40139
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40139
- OSV: https://osv.dev/vulnerability/CVE-2026-40139

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40139/
Summaries are generated and may contain mistakes; the official description above is the record.