Auth bypass in Winsiderss System Informer
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/winsiderss/systeminformer/commit/ce451a264a424f6f386b1615df651f8364a… (patch)
- github.com/winsiderss/systeminformer/blob/v3.2.25011.2103/SystemInformer/phsvc/… (technical-description)
- github.com/winsiderss/systeminformer/releases/tag/v4.0.26241.138 (release-notes)
- github.com/winsiderss/systeminformer (product)
- www.vulncheck.com/advisories/system-informer-before-4.0.26241.138-incorrect-aut… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-107782?
- CVE-2026-107782 is a high-severity vulnerability in Winsiderss System Informer, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2026-10-08.
- How severe is CVE-2026-107782?
- High severity. CVSS v3 base score is 7.8 out of 10.