CVE-2026-82042
UTMStack < 11.2.16 Authentication Bypass via InternalApiKeyFilter
UTMStack UTMStack
CVSS
9.3CriticalExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.55%Chance of exploitation activity in the next 30 days, higher than 45% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 11.2.16UTMStackCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 1
- UTMStackaffected: all versions before 11.2.16CVE List