CVE-2026-51947: Pivotal CRM RCE Vulnerability

CVE-2026-51947 Overview

CVE-2026-51947 is an insecure deserialization vulnerability [CWE-502] affecting Pivotal CRM 6.6.4.08. The flaw resides in the Pivotal.Engine.Client.Services.Conversion.dll component and enables remote attackers to execute arbitrary code on affected systems. This CVE exists because of an incomplete fix for the earlier CVE-2026-39253 issue. Systems patched with patch-ghi-15381-cwe-502-20251225.zip remain vulnerable. Aurea has released Pivotal CRM 6.6.5.10 and Patch_CWE502_20260316.zip to remediate the issue.

Critical Impact
Remote attackers can achieve arbitrary code execution against Pivotal CRM Smart Client deployments through unsafe .NET object deserialization.

Affected Products

Pivotal CRM 6.6.4.08
Pivotal CRM systems patched with patch-ghi-15381-cwe-502-20251225.zip
Pivotal.Engine.Client.Services.Conversion.dll component

Discovery Timeline

2026-07-01 - CVE-2026-51947 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-51947

Vulnerability Analysis

CVE-2026-51947 is an insecure deserialization vulnerability in the Pivotal.Engine.Client.Services.Conversion.dll assembly used by Pivotal CRM 6.6.4.08. The component deserializes attacker-controlled data without adequate type restrictions or integrity checks. An attacker with remote reachability to the affected service can submit crafted serialized objects that trigger arbitrary code execution during deserialization. The current EPSS score sits at 0.573% (43.116 percentile), reflecting limited observed exploitation activity to date.

Root Cause

The vulnerability stems from unsafe .NET deserialization within the Conversion service. The prior fix distributed as patch-ghi-15381-cwe-502-20251225.zip did not fully constrain the set of types accepted during deserialization. Attackers can bypass the incomplete allow-listing and reach dangerous gadget chains that execute code when object graphs are reconstructed.

Attack Vector

A remote attacker submits a serialized payload targeting the vulnerable Conversion component. The service reconstructs the object graph, invoking constructors, setters, or callback methods on attacker-chosen types. Those callbacks execute arbitrary code in the process context. Because this CVE is an incomplete-fix bypass of CVE-2026-39253, exploitation techniques from the earlier advisory can be adapted. See the GitHub CVE-2026-51947 Advisory for technical details on the bypass.

Detection Methods for CVE-2026-51947

Indicators of Compromise

Unexpected child processes spawned by Pivotal CRM Smart Client or backend service processes hosting Pivotal.Engine.Client.Services.Conversion.dll.
Anomalous inbound traffic containing serialized .NET BinaryFormatter or NetDataContractSerializer payloads directed at Pivotal CRM endpoints.
Application crash logs or exceptions referencing deserialization failures inside the Conversion assembly.

Detection Strategies

Inspect application logs for exceptions thrown from Pivotal.Engine.Client.Services.Conversion during object reconstruction.
Monitor for gadget-chain indicators such as System.Windows.Data.ObjectDataProvider, System.Diagnostics.Process, or TypeConfuseDelegate type references in traffic to Pivotal services.
Baseline process trees for Pivotal CRM services and alert on deviations such as cmd.exe, powershell.exe, or rundll32.exe execution.

Monitoring Recommendations

Enable verbose logging on the Pivotal CRM Conversion service and forward events to a centralized SIEM for correlation.
Instrument network sensors to flag serialized payload signatures targeting Pivotal endpoints.
Track file integrity of the Pivotal.Engine.Client.Services.Conversion.dll assembly to identify unauthorized modification or replacement.

How to Mitigate CVE-2026-51947

Immediate Actions Required

Upgrade to Pivotal CRM 6.6.5.10 or apply Patch_CWE502_20260316.zip on any deployment currently running 6.6.4.08 or carrying the incomplete patch-ghi-15381-cwe-502-20251225.zip.
Inventory Pivotal CRM Smart Client and backend hosts to confirm which patch level is installed on each system.
Restrict network exposure of Pivotal CRM services to trusted internal segments while patching is validated.

Patch Information

Aurea has published remediation guidance in the Aurea Security Article. The fixed release is Pivotal CRM 6.6.5.10, and the corrective patch package is Patch_CWE502_20260316.zip. Administrators should verify that the older patch-ghi-15381-cwe-502-20251225.zip is superseded, since that earlier patch does not fully remediate the deserialization flaw.

Workarounds

Block untrusted network access to Pivotal CRM Conversion service endpoints using host firewalls or network ACLs until patching is complete.
Require authenticated VPN or Zero Trust Network Access for all Pivotal CRM Smart Client sessions.
Enable application allow-listing on Pivotal CRM servers to prevent unauthorized child process execution originating from the Conversion service.

bash

# Example: restrict inbound access to Pivotal CRM service port using Windows Firewall
netsh advfirewall firewall add rule name="Pivotal CRM - Trusted Subnet Only" \
    dir=in action=allow protocol=TCP localport=<pivotal_port> \
    remoteip=10.0.0.0/8 profile=any
netsh advfirewall firewall add rule name="Pivotal CRM - Block Others" \
    dir=in action=block protocol=TCP localport=<pivotal_port>