CVE-2026-5652

CriticalPublic PoC

Published: 21 April 2026

Published

21 April 2026

Modified

27 April 2026

KEV Added

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Patch

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CVSS Score 9.0 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L

EPSS Score 0.0010 27.3th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-5652 is a critical-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Craftycontrol Crafty Controller. Its CVSS base score is 9.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and AC-24 (Access Control Decisions).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) 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

AC-3 Access Enforcement good match

prevent

Enforces approved authorizations for logical access, directly addressing the improper API permissions validation that enables IDOR-based unauthorized user modifications.

AC-24 Access Control Decisions partial match

prevent

Requires access control decisions based on predefined criteria such as roles or attributes, mitigating flawed decisions in the Users API for specific object references.

AC-6 Least Privilege partial match

prevent

Limits privileges to the minimum necessary, reducing the impact of high-privilege attackers exploiting IDOR to modify unauthorized user accounts.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1098 Account Manipulation Persistence

Adversaries may manipulate accounts to maintain and/or elevate access to victim systems.

attack.mitre.org →

Why these techniques?

IDOR in Users API enables exploitation of public-facing application (T1190) and unauthorized user modification consistent with account manipulation (T1098).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

An insecure direct object reference vulnerability in the Users API component of Crafty Controller allows a remote, authenticated attacker to perform user modification actions via improper API permissions validation.

Deeper analysisAI

CVE-2026-5652 is an insecure direct object reference (IDOR) vulnerability, mapped to CWE-639, in the Users API component of Crafty Controller. Published on 2026-04-21T17:16:57.793, it arises from improper API permissions validation, allowing unauthorized access to user modification actions. The vulnerability carries a CVSS v3.1 base score of 9.0 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L), indicating critical severity due to its network accessibility, low attack complexity, and significant impacts.

A remote, authenticated attacker with high privileges can exploit this flaw without user interaction. By leveraging the IDOR in the Users API, the attacker can perform unauthorized user modification actions, potentially compromising confidentiality and integrity of user data at a high level, with a low impact on availability, and scope crossing into changed components.

Advisories and further details, including potential patches, are documented in the Crafty Controller GitLab repository work item at https://gitlab.com/crafty-controller/crafty-4/-/work_items/705.