CVE-2026-107782 System Informer before 4.0.26241.138 Incorrect Authorization in phsvc ALPC Port
Local attackers can escalate privileges to SYSTEM by connecting to the phsvc helper port from a signed process, requiring an upgrade to System Informer.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107782?
CVE-2026-107782 is a high-severity missing authorization vulnerability in winsiderss System Informer, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-107782?
How do I fix CVE-2026-107782?
No fix has been published for CVE-2026-107782 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-107782 being exploited?
There is no known exploitation of CVE-2026-107782 in the wild and no public exploit code.
Sources
Also known as GHSA-mx65-q648-g54f.