{"id":"CVE-2026-82042","published":"2026-10-02T21:16:56.643","lastModified":"2026-10-06T15:25:00.650","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.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-306"],"vendors":[],"products":[],"references":[{"url":"https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16","tags":[]},{"url":"https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd","tags":[]},{"url":"https://www.vulncheck.com/advisories/utmstack-authentication-bypass-via-internalapikeyfilter","tags":[]}],"exploitRefs":[{"url":"https://github.com/UTMStack/UTMStack/releases/tag/v11.2.16","tags":[]},{"url":"https://github.com/utmstack/UTMStack/commit/4e7a727c3b8d8e2ad020d3b4f982a6d085dbecdd","tags":[]}],"hasPoc":true,"ai":{"summary":"UTMStack before 11.2.16 allows remote attackers to bypass authentication by using a valid Utm-Internal-Key header, gaining full administrative API access.","exploitability":"Exploitation is relatively straightforward if the attacker has access to the Utm-Internal-Key header value, which can be obtained through various means.","blast_radius":"Exploitation could lead to complete control over the UTMStack system, including account creation, user management, data exfiltration, and rule modification, with severe real-world impact.","remediation":"Upgrade to UTMStack 11.2.16 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","api","admin","web"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-03T08:45:24.507Z"}}