CVE-2026-106126 in Identity Exposure
Summary
by MITRE • 10/08/2026
A command injection vulnerability in the Active Directory Events Listener of Tenable Identity Exposure (SaaS) allows an authenticated, low-privileged attacker to execute arbitrary commands as SYSTEM on the PDCe.
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Analysis
by VulDB Data Team • 10/08/2026
The identified security flaw resides within the Active Directory Events Listener component of Tenable Identity Exposure, a Software-as-a-Service platform designed for monitoring and analyzing identity-related activities. This vulnerability represents a critical failure in input validation and command construction mechanisms, specifically classified under CWE-78 Improper Neutralization of Special Elements used in an OS Command. The core technical issue stems from the application's handling of data retrieved from Active Directory events without adequate sanitization or parameterization before passing it to underlying operating system commands. When the listener processes specific event attributes, it incorporates user-controllable input directly into shell command strings executed with elevated privileges on the Primary Domain Controller emulator role holder within an Active Directory infrastructure.
The severity of this vulnerability is significantly amplified by its authentication requirements and privilege level. An attacker who has obtained valid credentials for a low-privileged account in the target environment can exploit this flaw without needing administrative rights or complex pre-authentication steps beyond standard login procedures. This accessibility lowers the barrier to entry for adversaries, allowing them to leverage common credential theft techniques such as phishing, pass-the-hash attacks, or exploitation of other lower-severity vulnerabilities to gain initial access. Once authenticated, the attacker can craft malicious inputs that trigger arbitrary command execution on the server hosting the Active Directory Events Listener service.
The operational impact of this vulnerability is severe due to the context in which the commands are executed. The system processes these events with SYSTEM-level privileges, effectively granting full control over the underlying operating system when exploited successfully. An attacker can execute any command permitted by the Windows environment for the SYSTEM account, including creating new administrative accounts, modifying security policies, disabling logging mechanisms, or deploying additional malware such as remote access trojans and ransomware. This capability allows for complete compromise of the Active Directory infrastructure, facilitating lateral movement across the network and potentially leading to total domain takeover. The ability to execute commands on the PDCe is particularly dangerous because this role holds write permissions for critical AD objects and schema changes in many configurations, further expanding the potential blast radius of the attack.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK techniques related to Command and Scripting Interpreter abuse (T1059) and System Service Discovery or modification depending on the specific commands executed. It also facilitates persistence mechanisms such as creating scheduled tasks or modifying service configurations if the attacker chooses to establish long-term access rather than immediate data exfiltration. The exploitation path demonstrates how a seemingly minor input validation error in an identity monitoring tool can become a critical entry point for escalating privileges and compromising core infrastructure components.
Mitigation strategies must focus on both technical remediation and operational hardening. Tenable has released patches that address the root cause by implementing strict input sanitization, using parameterized command execution instead of string concatenation, and applying principle of least privilege to the service account running the Active Directory Events Listener. Organizations utilizing this SaaS solution should apply these updates immediately upon availability. In addition to patching, security teams should enforce multi-factor authentication for all administrative accounts to reduce the risk of credential theft leading to exploitation. Network segmentation strategies should be reviewed to ensure that even if an attacker gains access through a low-privileged account, their ability to reach and exploit vulnerable services is restricted by zero-trust principles. Continuous monitoring for anomalous command execution patterns on domain controllers can also help detect attempted exploits in real-time before significant damage occurs.