CVE-2026-82042
UTMStack < 11.2.16 Authentication Bypass via InternalApiKeyFilter
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 2, 2026
- Updated
- Oct 5, 2026
- Reserved
- Aug 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
UTMStackUTMStack |
|
References
- UTMStack v11.2.16 Release Notesrelease-notes
- Patch Commitpatch
- https://www.vulncheck.com/advisories/utmstack-authentication-bypass-via-internalapikeyfilterthird-party-advisory
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