CVE-2026-28747

High

Published: 27 April 2026

Published

27 April 2026

Modified

28 April 2026

KEV Added

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Patch

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CVSS Score 7.1 CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Score 0.0002 3.6th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-28747 is a high-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Cisa (inferred from references). Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation of Remote Services (T1210); ranked at the 3.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 IA-5 (Authenticator Management) and SC-12 (Cryptographic Key Establishment and Management).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploitation of Remote Services (T1210) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Requires timely flaw remediation, directly addressing the weak key generation vulnerability through application of vendor-provided firmware patches.

SC-12 Cryptographic Key Establishment and Management good match

prevent

Mandates secure cryptographic key establishment and management, preventing weak key generation flaws in firmware authentication processes.

IA-5 Authenticator Management good match

prevent

Ensures authenticators including cryptographic keys possess sufficient strength of mechanism to mitigate authorization bypass via weak keys.

MITRE ATT&CK Enterprise TechniquesAI

T1210 Exploitation of Remote Services Lateral Movement

Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.

attack.mitre.org →

T1606 Forge Web Credentials Credential Access

Adversaries may forge credential materials that can be used to gain access to web applications or Internet services.

attack.mitre.org →

Why these techniques?

Weak cryptographic key generation directly enables authorization bypass on camera remote interfaces (T1210 Exploitation of Remote Services) and allows prediction/generation of valid auth material (T1606 Forge Web Credentials).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

A weak key generation vulnerability exists in specific firmware versions of Milesight AIOT cameras allows authorization to be bypassed.

Deeper analysisAI

A weak key generation vulnerability, tracked as CVE-2026-28747 and associated with CWE-639, affects specific firmware versions of Milesight AIoT cameras. This flaw enables attackers to bypass authorization mechanisms due to insufficiently strong cryptographic keys used in the authentication process. The vulnerability carries a CVSS v3.1 base score of 7.1 (AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating high potential impact on confidentiality, integrity, and availability.

Exploitation requires an attacker to be on an adjacent network (AV:A) with no privileges (PR:N), though it demands high attack complexity (AC:H) and user interaction (UI:R), such as tricking a user into performing a specific action. Successful exploitation allows bypassing authorization, potentially granting unauthorized access to the camera's functions and data, resulting in high-impact compromise across confidentiality, integrity, and availability without changing scope.

CISA has published ICS Advisory ICSA-26-113-03 detailing the vulnerability, available at cisa.gov and in CSAF JSON format on GitHub. Milesight provides firmware downloads for mitigation at milesight.com/support/download/firmware, recommending affected users update to patched versions to address the weak key generation issue.