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 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 4.0

8.5CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-25)

CWE

CWE-863

Published

2026-10-08

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

References

• https://github.com/winsiderss/systeminformer
• https://github.com/winsiderss/systeminformer/blob/v3.2.25011.2103/SystemInformer/phsvc/svcapiport.c#L196-L230
• https://github.com/winsiderss/systeminformer/commit/ce451a264a424f6f386b1615df651f8364aaeb9f
• https://github.com/winsiderss/systeminformer/releases/tag/v4.0.26241.138
• https://www.vulncheck.com/advisories/system-informer-before-4.0.26241.138-incorrect-authorization-in-phsvc-alpc-port

Check your stackJSON