CVE-2026-8592: Rapid7 InsightConnect AWK Plugin RCE Flaw

CVE-2026-8592 Overview

CVE-2026-8592 is an OS Command Injection vulnerability [CWE-78] in the process_string action of the Rapid7 InsightConnect AWK Plugin on Linux. The flaw stems from unsafe shell command construction in the processing pipeline. Remote attackers can execute arbitrary operating system commands by injecting payloads through the text or expression parameters. The vulnerability is exploitable over the network without authentication or user interaction, though successful exploitation requires meeting specific runtime conditions.

Critical Impact
Successful exploitation allows remote attackers to execute arbitrary OS commands on the host running the InsightConnect AWK Plugin, leading to confidentiality and integrity compromise of the orchestration workflow environment.

Affected Products

Rapid7 InsightConnect AWK Plugin (Linux)
process_string action within the plugin
Workflow environments invoking the affected action with attacker-controlled text or expression parameters

Discovery Timeline

2026-06-25 - CVE-2026-8592 published to NVD
2026-06-25 - Last updated in NVD database

Technical Details for CVE-2026-8592

Vulnerability Analysis

The vulnerability resides in the process_string action of the Rapid7 InsightConnect AWK Plugin. The plugin processes user-supplied input through awk, a Linux text-processing utility, by constructing a shell command and passing it to the operating system. The construction does not sanitize or safely quote the text and expression parameters before they reach the shell interpreter.

An attacker who can supply values to these parameters can break out of the intended awk invocation and append arbitrary commands. Because the InsightConnect platform is typically deployed to automate security operations, the plugin runs in a privileged orchestration context with access to integrated systems and credentials.

The attack vector is network-based with high attack complexity, reflecting the conditional requirements for reaching the vulnerable action with attacker-controlled inputs. The impact on confidentiality and integrity is high, while availability impact is limited.

Root Cause

The root cause is unsafe shell command construction. The process_string handler concatenates user input into a shell command string rather than passing arguments through a safe execution interface that separates the command from its arguments. Shell metacharacters such as ;, |, `, $(), and && retain their special meaning when the constructed string is evaluated by the shell.

Attack Vector

An attacker triggers the vulnerability by supplying a crafted value to the text or expression parameter of the process_string action. When the plugin builds the shell command using the unsanitized input, the injected metacharacters terminate the legitimate command and introduce attacker-controlled commands. These commands execute under the user account running the plugin process.

Exploitation paths include workflows that pass external data—such as webhook payloads, ticket fields, or alert contents—directly into the text or expression parameters without prior sanitization. Refer to the Rapid7 Extension Overview for plugin configuration details.

Detection Methods for CVE-2026-8592

Indicators of Compromise

Unexpected child processes spawned by the InsightConnect plugin runtime, particularly shells such as /bin/sh or /bin/bash invoking commands beyond awk.
Outbound network connections from the InsightConnect host to unknown destinations following plugin execution.
Workflow logs showing text or expression parameters containing shell metacharacters such as ;, |, `, or $().

Detection Strategies

Inspect workflow execution logs for invocations of the process_string action with parameter values that contain shell metacharacters or command keywords.
Monitor process ancestry on hosts running the AWK Plugin, alerting on any process other than awk spawned as a child of the plugin runtime.
Correlate plugin executions with file system writes, credential access, or network egress that occur within the same time window.

Monitoring Recommendations

Enable verbose logging of InsightConnect plugin inputs and outputs, and forward logs to a central SIEM for correlation.
Baseline normal process trees for the InsightConnect host and alert on deviations originating from plugin execution.
Review and audit all workflows that route untrusted external data into the AWK Plugin parameters.

How to Mitigate CVE-2026-8592

Immediate Actions Required

Identify all workflows that use the Rapid7 InsightConnect AWK Plugin process_string action and inventory the data sources feeding the text and expression parameters.
Disable or pause workflows that pass untrusted external input directly into the affected parameters until a fixed plugin version is deployed.
Apply the latest patched version of the AWK Plugin from the Rapid7 Extensions marketplace as soon as it becomes available.

Patch Information

Monitor the Rapid7 Extension Overview page for plugin version updates that address the unsafe shell command construction. Upgrade affected plugin instances to the patched version once published by Rapid7.

Workarounds

Sanitize workflow inputs upstream of the AWK Plugin by stripping shell metacharacters (;, |, `, $, &, \, newlines) before invoking process_string.
Restrict workflow editing and execution permissions to trusted operators to reduce the chance of attacker-controlled parameters reaching the action.
Run the InsightConnect plugin runtime under a least-privilege account and apply Linux process isolation (for example, seccomp or AppArmor profiles) to limit the impact of command execution.

bash

# Configuration example: restrict the plugin runtime user
# Create a dedicated unprivileged user for the plugin runtime
sudo useradd --system --no-create-home --shell /usr/sbin/nologin insightconnect-awk

# Run the plugin container or process as that user (example with Docker)
docker run --user insightconnect-awk \
  --read-only \
  --cap-drop=ALL \
  --security-opt no-new-privileges \
  rapid7/insightconnect-plugin-awk:latest