CVE-2026-92943
Raw vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-92943 is a critical-severity Improper Validation of Certificate with Host Mismatch (CWE-297) vulnerability in Amazon (inferred from references). Its CVSS base score is 9.2 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Adversary-in-the-Middle (T1557); ranked at the 20th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SA-8 (Security and Privacy Engineering Principles) and SC-23 (Session Authenticity) — see the control section below for these in your framework.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-82378
Vulnerability Data
Improper validation of certificate with host mismatch in the MQTT client TLS connection layer in AWS IoT Device SDK for Python 1.5.3 through 1.6.0 on Python 3.7 and later might allow an adversary-in-the-middle actor to impersonate the AWS IoT Core…
more
endpoint, read device telemetry, and inject arbitrary MQTT messages that the device processes as authentic, via a certificate issued for an unrelated hostname by a certificate authority present in the device trust store. To remediate this issue, users should upgrade to version 1.6.1.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V17.2.8
Mitigating Controls (NIST 800-53 r5) AI
Security engineering principles require correct implementation of certificate validation (including hostname matching) when cryptography is used.
Protecting session authenticity structurally requires proper certificate validation to bind the presented certificate to the intended host.
Requiring confidentiality and integrity of transmitted data necessitates correct TLS certificate validation with host-name checking.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Server/service authentication via certificates directly requires correct host validation.
Protecting data-in-transit integrity depends on proper certificate validation to prevent MITM.
Secure development practices include coding correct certificate validation logic.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Network security controls include certificate validation and host-name verification to prevent man-in-the-middle attacks.
Security of network services requires proper TLS configuration and certificate validation for service endpoints.
Use of cryptography mandates correct implementation of certificate validation and hostname verification.
Application security requirements include secure communication and certificate validation for external services.
Secure system architecture principles require proper certificate validation to protect communications.
Secure coding practices include implementing proper certificate and hostname validation in code.