---
title: "CVE-2026-82042: UTMStack - Authentication Bypass"
description: "UTMStack < 11.2.16 contains an authentication bypass caused by acceptance of a valid Utm-Internal-Key header without path restriction or rate limiting in InternalApiKeyFilter, letting remote attackers gain full administrative API access, exploit requires attacker to know INTERNAL_KEY value."
url: https://panop.io/threat-heartbeat/CVE-2026-82042/
---

# CVE-2026-82042 UTMStack - Authentication Bypass

UTMStack < 11.2.16 contains an authentication bypass caused by acceptance of a valid Utm-Internal-Key header without path restriction or rate limiting in InternalApiKeyFilter, letting remote attackers gain full administrative API access, exploit requires attacker to know INTERNAL\_KEY value.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.55% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-82042)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to version 11.2.16 or later.

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-2026-82042](https://nvd.nist.gov/vuln/detail/CVE-2026-82042)
- [https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd](https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd)
- [https://www.vulncheck.com/advisories/utmstack-authentication-bypass-via-internalapikeyfilter](https://www.vulncheck.com/advisories/utmstack-authentication-bypass-via-internalapikeyfilter)
- [https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16](https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16)

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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

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