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From The CircuitryVerified tech news, cross-checked.How we verify →
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NVD, CVE.org, VulnCheck, and TheHackerWire all confirm the System Informer CVE-2026-107782 local privilege-escalation flaw before v4.0.26241.138.

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Home/Security/System Informer before 4.0.26241.138 exposed to local privilege escalation
VERIFIEDBy Xavier Rivera·Friday, October 9, 2026 at 2:55 PM AST·1 min read

System Informer before 4.0.26241.138 exposed to local privilege escalation

Winsiderss System Informer versions through 4.0.26241.138 contain an incorrect authorization flaw that lets local attackers execute code as SYSTEM from any signed process. Vulncheck rates the issue 7.8 and 8.5.

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System Informer before 4.0.26241.138 exposed to local privilege escalation
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TL;DRAI · 60 sec read

System Informer versions before 4.0.26241.138 contain a local privilege escalation flaw in the phsvc helper service. Incorrect authorization checks let any Authenticode-signed process connect to the SiSvcApiPort ALPC port and create SYSTEM services via PhSvcApiCreateService. CVE-2026-107782 carries CVSS scores of 7.8 and 8.5. Users on earlier builds stay exposed until they update.

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A high-severity vulnerability in Winsiderss System Informer allows local attackers to execute code with SYSTEM privileges.

Vulncheck assigns two CVSS scores to the flaw. The organization rates CVE-2026-107782 at 7.8 under its standard assessment and 8.5 under its CNA role. Both scores fall into the HIGH severity category.
Incorrect authorization checks let any Authenticode-signed process connect to the SiSvcApiPort ALPC port.

The vector describes a local attack with low complexity that requires low privileges and no user interaction. Impact covers high confidentiality, integrity, and availability loss.

The flaw sits in the phsvc helper service. Incorrect authorization checks let any Authenticode-signed process connect to the SiSvcApiPort ALPC port. Attackers can load code into a Microsoft-signed binary such as rundll32.exe to reach the port.
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Once connected, the attacker can invoke PhSvcApiCreateService to create and start a service that runs as SYSTEM. The issue affects every release from version 0 through 4.0.26241.138.
Once connected, the attacker can invoke PhSvcApiCreateService to create and start a service that runs as SYSTEM.

A commit in the public repository addresses the authorization check. The project released version 4.0.26241.138 to close the gap. Users running earlier builds remain exposed until they update.
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The vulnerability record lists the project repository and advisory for further reference. No other mitigations appear in the published details.
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