CVE-2026-24291 is classified as a high-severity vulnerability impacting Microsoft Windows systems. This vulnerability allows an authorized attacker to elevate privileges locally due to incorrect permission assignment for a critical resource in the Windows Accessibility Infrastructure (ATBroker.exe). The associated CVSS score of 7.8 indicates a significant risk, necessitating immediate attention from security professionals.
Risk to organizations includes potential unauthorized access to sensitive data and system control, which could be exploited by attackers with local access. The urgency for defenders is highlighted by the exploitability and the potential impact on confidentiality, integrity, and availability.
As of now, there are known exploits for this vulnerability, emphasizing the need for organizations to prioritize patching immediately. Failure to address this vulnerability could lead to severe consequences in the operational environment.
Organizations using affected versions of Windows should take this vulnerability seriously and ensure that proper mitigation strategies are in place.
Vulnerability Details
The official description of this vulnerability states that incorrect permission assignment for critical resources in Windows Accessibility Infrastructure (ATBroker.exe) allows an authorized attacker to elevate privileges locally. The CVSS version is 3.1, with a vector string of 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H', which indicates a local attack vector, low attack complexity, and high impacts on confidentiality, integrity, and availability.
This vulnerability affects several versions of Windows, including Windows 10 (various builds) and Windows Server editions. The vulnerability was published on March 10, 2026, and is associated with CWE-732, which relates to incorrect permission assignment.
Technical Analysis
The root cause of CVE-2026-24291 lies in the incorrect permission assignments within the Windows Accessibility Infrastructure, specifically affecting ATBroker.exe. The attack vector is local, meaning that an attacker would need to have local access to the system to exploit this vulnerability. The complexity of the attack is low, indicating that it can be executed with minimal effort by an attacker who has local access.
The privileges required to exploit this vulnerability are low, meaning that an attacker does not need elevated privileges to perform the attack. Furthermore, there is no user interaction required, which significantly eases the exploitation process. The impacts of this vulnerability are severe, with high confidentiality, integrity, and availability impacts, allowing attackers to potentially gain control over sensitive system resources.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to critical systems and data, which could lead to data breaches or other malicious activities. The blast radius of this vulnerability could affect any system that runs the impacted versions of Windows, making it crucial for organizations to evaluate their deployment risk and take appropriate measures.
Given the CVSS score of 7.8 and the absence of it being included in the Known Exploited Vulnerabilities (KEV) catalog, organizations should address this vulnerability in their priority patch cycle. The low EPSS score indicates a lower likelihood of exploitation, but the potential impact remains high.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
CVE-2026-24291 affects multiple versions of Microsoft Windows, including:
- Windows 10 (1607, 1809, 21H2, 22H2) - Windows 11 (23H2, 24H2, 25H2, 26H1) - Windows Server (2012, 2016, 2019, 2022, 2022 23H2, 2025) All versions prior to vendor patch are affected.
Mitigation & Remediation
Organizations should apply available patches to mitigate this vulnerability. The specific version to upgrade to should be determined based on the system architecture and the Windows version in use. If a patch is unavailable, organizations should consider implementing workarounds such as restricting access to ATBroker.exe and monitoring for suspicious activities that may indicate exploitation attempts.
For enhanced security, organizations may also consider configuration hardening and implementing network controls to limit exposure to potential threats.
Regular monitoring and security assessments are recommended to ensure the effectiveness of the implemented security measures.
Detection Guidance
Security teams should monitor log indicators for unusual access patterns to ATBroker.exe. Behavioral anomalies, such as unexpected privilege escalations or unauthorized changes to critical system files, should be investigated promptly. Network signatures indicating exploitation attempts should also be analyzed to enhance detection capabilities.
AppSecure Threat Intelligence Insight
CVE-2026-24291 highlights the ongoing issues related to privilege escalation vulnerabilities in widely used operating systems. The presence of public proof-of-concept (PoC) exploits indicates that threat actors may seek to exploit this vulnerability, even if actively exploited status is currently marked as 'No'.
Organizations need to remain vigilant about potential exploitation techniques and update their security posture accordingly. It is crucial to establish a robust vulnerability management program to address similar vulnerabilities effectively. For more insights into managing vulnerabilities, security teams can refer to the vulnerability management program design and ensure that their environments are secured against evolving threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)