CVE-2026-82042

UTMStack before 11.2.16 contains an authentication bypass vulnerability that allows remote attackers to gain full administrative API access by presenting a valid Utm-Internal-Key header matching the INTERNAL_KEY environment variable value, which the InternalApiKeyFilter accepts for any endpoint without path restriction, constant-time comparison, rate limiting, or audit logging. Attackers who obtain the key value can authenticate without a user account or JWT to create accounts, manage users, exfiltrate data, and modify security rules.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16
https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd
https://www.vulncheck.com/advisories/utmstack-authentication-bypass-via-internalapikeyfilter

Configurations

No configuration.

History

02 Oct 2026, 21:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-02 21:16

Updated : 2026-10-06 15:25

NVD link : CVE-2026-82042

Mitre link : CVE-2026-82042

CVE.ORG link : CVE-2026-82042

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

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