CVE-2026-107782
System Informer before 4.0.26241.138 Incorrect Authorization in phsvc ALPC Port
- State
- Published
- Severity
- 8.5 High
- Published
- Oct 8, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 8, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.5 High | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
System Informerwinsiderss |
|
References
- Patch Commitpatch
- https://github.com/winsiderss/systeminformer/blob/v3.2.25011.2103/SystemInformer/phsvc/svcapiport.c#L196-L230technical-description
- System Informer v4.0.26241.138 Release Notesrelease-notes
- https://github.com/winsiderss/systeminformerproduct
- VulnCheck Advisory: System Informer before 4.0.26241.138 Incorrect Authorization in phsvc ALPC Portthird-party-advisory
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