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CVE-2026-107782— System Informer before 4.0.26241.138 Incorrect Authorization in phsvc ALPC Port

Quick assessment

Affected
winsiderss System Informer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 System Informer 4.0.26241.138 版本之前，phsvc 辅助组件存在一个不正确的授权漏洞，允许本地攻击者通过从任何经过 Authenticode 签名的进程发起连接，来访问特权 API。攻击者可以将代码加载到由 Microsoft 签名的主机进程中（例如 rundll32.exe），然后连接到 SiSvcApiPort 端口，并调用 PhSvcApiCreateService 接口，从而以 SYSTEM 权限执行代码。

CVSS 7.8 · High
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I. Basic Information for CVE-2026-107782

Vulnerability Information
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Vulnerability Title
System Informer before 4.0.26241.138 Incorrect Authorization in phsvc ALPC Port
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
winsiderss System Informer 0 ~ 4.0.26241.138 -

II. Public POCs for CVE-2026-107782

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III. Intelligence Information for CVE-2026-107782

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Patches & Fixes for CVE-2026-107782 (2)

Vendor Advisories for CVE-2026-107782 (1)

Vendor Pages for CVE-2026-107782 (1)

IV. Related Vulnerabilities

Same weakness: CWE-863

V. Comments for CVE-2026-107782

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