CVE-2026-107782

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Incorrect Authorization in System Informer phsvc Helper Allows Privilege Escalation

Publication date: 2026-10-08

Last updated on: 2026-10-08

Assigner: VulnCheck

Description

System Informer before 4.0.26241.138 contains an incorrect authorization vulnerability in the phsvc helper that allows local attackers to reach privileged APIs by connecting from any Authenticode-signed process. Attackers can load code into a Microsoft-signed host like rundll32.exe, connect to SiSvcApiPort, and call PhSvcApiCreateService to execute code as SYSTEM.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-08

Last Modified

2026-10-08

Generated

2026-10-09

AI Q&A

2026-10-09

EPSS Evaluated

N/A

NVD

CVE-2026-107782

Affected Vendors & Products

Vendor	Product	Version / Range
winsiderss	System	Informer 0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

System Informer before version 4.0.26241.138 has an authorization flaw in its phsvc helper. Local attackers can exploit this by running code in a Microsoft-signed process like rundll32.exe. They connect to SiSvcApiPort and call PhSvcApiCreateService to execute code with SYSTEM privileges.

Detection Guidance

Detecting this vulnerability requires checking for unauthorized use of the phsvc helper or suspicious connections to SiSvcApiPort. Monitor for unexpected SYSTEM-level processes launched by Authenticode-signed binaries like rundll32.exe. Check logs for unusual API calls to PhSvcApiCreateService.

Impact Analysis

If exploited, attackers could gain full control over your system, install malware, steal data, or create backdoors. Since it requires local access, physical or network access to the machine is needed, but the impact is severe once exploited.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and access controls. Organizations using affected versions may face compliance failures and legal penalties.

Mitigation Strategies

Update System Informer to version 4.0.26241.138 or later to address the authorization vulnerability. Avoid using Authenticode-signed processes to interact with System Informer's phsvc helper.

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