---
title: "CVE-2026-83540: wolfSSH - Broken Access Control"
description: "wolfSSH Windows port 1.4.15 through 1.5.0 contains a broken access control caused by improper release of Windows logon tokens between connections, letting less privileged users escalate privileges by login poisoning, exploit requires valid user account."
url: https://panop.io/threat-heartbeat/CVE-2026-83540/
---

# CVE-2026-83540 wolfSSH - Broken Access Control

wolfSSH Windows port 1.4.15 through 1.5.0 contains a broken access control caused by improper release of Windows logon tokens between connections, letting less privileged users escalate privileges by login poisoning, exploit requires valid user account.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-83540)

## Details

Type

Broken Access Control

Impact

Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-287](https://cwe.mitre.org/data/definitions/287.html)

## Vendor fix

Update to a version later than 1.5.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-83540](https://nvd.nist.gov/vuln/detail/CVE-2026-83540)
- [https://github.com/wolfSSL/wolfssh](https://github.com/wolfSSL/wolfssh)
- [https://github.com/wolfSSL/wolfssh/commit/9777bc5ce810d6c418a1473e9e8c40cdb0026e5a](https://github.com/wolfSSL/wolfssh/commit/9777bc5ce810d6c418a1473e9e8c40cdb0026e5a)
- [https://github.com/wolfSSL/wolfssh/commit/b6bd975ccfac6aadf29b98e35e09114bef3840a9](https://github.com/wolfSSL/wolfssh/commit/b6bd975ccfac6aadf29b98e35e09114bef3840a9)
- [https://www.wolfssl.com/docs/security-vulnerabilities/](https://www.wolfssl.com/docs/security-vulnerabilities/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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