CVE-2026-107782 — System Informer before 4.0.26241.138 contains an incorrect authorization vulnerability in the phsvc helper that allows local attackers to reach pri…
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 v4.0 base metrics
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XHigh severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Local
Attack Vector
AC
Low
Attack Complexity
AT
None
Attack Requirements
PR
Low
Privileges Required
UI
None
User Interaction
VC
High
Confidentiality (Vulnerable System)
VI
High
Integrity (Vulnerable System)
VA
High
Availability (Vulnerable System)
SC
None
Confidentiality (Subsequent System)
SI
None
Integrity (Subsequent System)
SA
None
Availability (Subsequent System)
References
- advisory[email protected]https://github.com/winsiderss/systeminformer
- advisory[email protected]https://github.com/winsiderss/systeminformer/blob/v3.2.25011.2103/SystemInformer/phsvc/svcapiport.c#L196-L230
- advisory[email protected]https://github.com/winsiderss/systeminformer/commit/ce451a264a424f6f386b1615df651f8364aaeb9f
- advisory[email protected]https://github.com/winsiderss/systeminformer/releases/tag/v4.0.26241.138
- advisory[email protected]https://www.vulncheck.com/advisories/system-informer-before-4.0.26241.138-incorrect-authorization-in-phsvc-alpc-port
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