CVE-2026-82042: critical vulnerability in UTMStack
UTMStack < 11.2.16 Authentication Bypass via InternalApiKeyFilter
Published · Updated
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.3epss 0.5%
exploitation probability
0.5%top 56% of all CVEs
observed exploitation
nono source reports it
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.
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
Affected products
UTMStack · UTMStackRelated CVEs — UTMStack
In the same product, most dangerous first.
CVE-2026-82041MEDIUMUTMStack < 11.2.16 Missing Authorization via Command WebSocketEPSS 0.4%CVE-2026-82039HIGHUTMStack < 11.2.16 SQL Injection via searchGroupsByFilterEPSS 0.3%CVE-2026-82045HIGHUTMStack < 11.2.16 JPQL Injection via searchPropertyValuesEPSS 0.3%CVE-2026-82044MEDIUMUTMStack < 11.2.16 Server-Side Request Forgery via downloadPdfEPSS 0.3%CVE-2026-82043MEDIUMUTMStack < 11.2.16 Account Enumeration via Password Reset EndpointEPSS 0.2%CVE-2026-82040MEDIUMUTMStack < 11.2.16 SSRF via IdentityProviderServiceEPSS 0.2%