UTMStack before 11.2.16 contains an authentication bypass vulnerability that allows remote attackers to gain full administrative API access by… (CVE-2026-82042)
UTMStack versions before 11.2.16 have an authentication bypass vulnerability (CVE-2026-82042) that allows remote attackers to gain full administrative API access by using a valid Utm-Internal-Key header matching the INTERNAL_KEY environment variable. This bypass does not require a user account or JWT and lacks path restrictions, constant-time comparison, rate limiting, or audit logging. Exploitation enables attackers to create accounts, manage users, exfiltrate data, and modify security rules.
AI Analysis
Technical Summary
The vulnerability in UTMStack before version 11.2.16 involves an authentication bypass via the InternalApiKeyFilter, which accepts a valid Utm-Internal-Key header matching the INTERNAL_KEY environment variable. This acceptance occurs for any API endpoint without restrictions or protections like rate limiting or audit logging. Consequently, possession of this key allows an attacker to authenticate without a user account or JWT token, enabling full administrative API access.
Potential Impact
An attacker who obtains the INTERNAL_KEY environment variable value can bypass authentication controls and gain full administrative API access. This includes the ability to create and manage user accounts, exfiltrate sensitive data, and alter security rules, leading to complete compromise of the affected system's security and confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in UTMStack version 11.2.16. Users should upgrade to version 11.2.16 or later to remediate this vulnerability. No other mitigation guidance is provided in the input data.
UTMStack before 11.2.16 contains an authentication bypass vulnerability that allows remote attackers to gain full administrative API access by… (CVE-2026-82042)
Description
UTMStack versions before 11.2.16 have an authentication bypass vulnerability (CVE-2026-82042) that allows remote attackers to gain full administrative API access by using a valid Utm-Internal-Key header matching the INTERNAL_KEY environment variable. This bypass does not require a user account or JWT and lacks path restrictions, constant-time comparison, rate limiting, or audit logging. Exploitation enables attackers to create accounts, manage users, exfiltrate data, and modify security rules.
CVSS v3.1
Score 9.8critical
Affected software
pkg:github/utmstack/UTMStackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in UTMStack before version 11.2.16 involves an authentication bypass via the InternalApiKeyFilter, which accepts a valid Utm-Internal-Key header matching the INTERNAL_KEY environment variable. This acceptance occurs for any API endpoint without restrictions or protections like rate limiting or audit logging. Consequently, possession of this key allows an attacker to authenticate without a user account or JWT token, enabling full administrative API access.
Potential Impact
An attacker who obtains the INTERNAL_KEY environment variable value can bypass authentication controls and gain full administrative API access. This includes the ability to create and manage user accounts, exfiltrate sensitive data, and alter security rules, leading to complete compromise of the affected system's security and confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in UTMStack version 11.2.16. Users should upgrade to version 11.2.16 or later to remediate this vulnerability. No other mitigation guidance is provided in the input data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-phx4-fx7q-vfw9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-82042"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
Threat ID: 6ac139b9a43b0b3b89d69d30
Added to database: 10/03/2026, 17:22:01 UTC
Last enriched: 10/03/2026, 17:42:07 UTC
Last updated: 10/03/2026, 21:11:48 UTC
Views: 5
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