CVE-2026-82042

Critical

Description

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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductUTMStack

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

UTMStack UTMStack11.2.16 or later

Patches

github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd

Vendor advisories

github.com/UTMStack/UTMStack/releases/tag/v11.2.16

Affected products

Product	Affected versions	Fixed in
UTMStack UTMStack	v < 11.2.16	11.2.16

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