CVE-2026-2630: Tenable Security Center RCE Vulnerability

CVE-2026-2630 Overview

A Command Injection vulnerability exists in Tenable Security Center that allows an authenticated, remote attacker to execute arbitrary code on the underlying server where the application is hosted. This vulnerability is classified under CWE-78 (Improper Neutralization of Special Elements used in an OS Command), indicating that user-supplied input is not properly sanitized before being passed to system command execution functions.

Critical Impact

Authenticated attackers can achieve remote code execution on Tenable Security Center servers, potentially compromising the security monitoring infrastructure and gaining access to sensitive vulnerability scan data across the enterprise.

Affected Products

• Tenable Security Center (specific versions detailed in Tenable Security Advisory TNS-2026-06)

Discovery Timeline

• 2026-02-17 - CVE-2026-2630 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-2630

Vulnerability Analysis

This command injection vulnerability allows authenticated remote attackers to execute arbitrary operating system commands on the server hosting Tenable Security Center. The vulnerability stems from improper neutralization of special elements in user-controlled input that is subsequently used in OS command construction. Since Tenable Security Center is a centralized vulnerability management platform, successful exploitation could provide attackers with access to sensitive security scan data, network topology information, and credentials stored within the system.

The network-based attack vector with low complexity requirements makes this vulnerability particularly concerning for organizations that expose their Security Center instance to broader network segments. While authentication is required, compromised or malicious insider credentials could enable full server compromise.

Root Cause

The root cause is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'). This occurs when the application constructs operating system commands using externally-influenced input from upstream components without properly neutralizing shell metacharacters and command separators. The lack of input validation or output encoding allows attackers to inject additional commands that execute with the privileges of the Tenable Security Center service account.

Attack Vector

The attack is conducted remotely over the network by an authenticated user. The attacker must have valid credentials to access the Tenable Security Center application. Once authenticated, the attacker can submit specially crafted input containing OS command injection payloads to vulnerable application endpoints. The malicious commands execute in the context of the application server, potentially allowing the attacker to:

• Execute arbitrary system commands
• Access or exfiltrate sensitive vulnerability scan data
• Pivot to other systems on the network
• Establish persistent backdoor access
• Compromise the integrity of security monitoring operations

The vulnerability mechanism involves crafting malicious input that includes command separators (such as ;, |, &&, or backticks) followed by attacker-controlled commands. When this input is passed to system command execution functions without proper sanitization, both the legitimate command and the injected command are executed. Refer to Tenable Security Advisory TNS-2026-06 for specific technical details and affected components.

Detection Methods for CVE-2026-2630

Indicators of Compromise

• Unusual process spawning from Tenable Security Center service processes (e.g., unexpected shell invocations, bash, sh, cmd.exe)
• Anomalous network connections originating from the Security Center server to external or unusual internal destinations
• Unexpected file creation or modification in system directories or web application paths
• Authentication events followed by suspicious command execution patterns in system logs

Detection Strategies

• Monitor Tenable Security Center application logs for requests containing shell metacharacters (;, |, &&, `, $())
• Implement endpoint detection rules to alert on child processes spawned by the Security Center application that are inconsistent with normal operation
• Deploy network intrusion detection signatures to identify command injection payload patterns in HTTP/HTTPS traffic to the Security Center
• Correlate authentication events with subsequent anomalous system behavior on the Security Center host

Monitoring Recommendations

• Enable comprehensive audit logging for the Tenable Security Center application and underlying operating system
• Implement real-time log analysis to detect command injection patterns and suspicious process execution chains
• Monitor system call activity on the Security Center server for unauthorized command execution
• Establish baseline normal behavior for the Security Center server to identify deviations indicative of compromise

How to Mitigate CVE-2026-2630

Immediate Actions Required

• Apply the security patch from Tenable as detailed in Tenable Security Advisory TNS-2026-06
• Restrict network access to Tenable Security Center to only authorized administrator IP ranges
• Review and audit all user accounts with access to Security Center, removing unnecessary privileges
• Enable enhanced logging and monitoring on the Security Center server pending patch application

Patch Information

Tenable has released a security update to address this vulnerability. Organizations should immediately consult Tenable Security Advisory TNS-2026-06 for specific patching instructions and affected version details. It is critical to apply this patch as soon as possible given the high severity of the vulnerability and the sensitive nature of data managed by Security Center.

Workarounds

• Implement strict network segmentation to limit access to Tenable Security Center to only essential administrative networks
• Deploy a Web Application Firewall (WAF) with rules to block common command injection patterns targeting the Security Center
• Enforce multi-factor authentication for all Security Center user accounts to reduce the risk of credential compromise
• Monitor and restrict outbound network connectivity from the Security Center server to prevent data exfiltration and command-and-control communication