CVE-2026-45313

HIGH 7.7

Sandboxie-Plus: Sandboxie APC Injection Sandbox Escape

CVSS Score

7.7

EPSS Score

0.0%

EPSS Percentile

0th

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. Prior to 1.17.6, GuiServer::WndHookRegisterSlave in Sandboxie/core/svc/GuiServer.cpp stores attacker-supplied hthread and hproc fields from a GUI_WND_HOOK_REGISTER request without validating that the thread belongs to the sandboxed process or that the function pointer is in the caller address space, and GuiServer::WndHookNotifySlave then calls OpenThread(THREAD_SET_CONTEXT, FALSE, whk->hthread) and QueueUserAPC((PAPCFUNC)whk->hproc, hThread, (ULONG_PTR)req->threadid) as SYSTEM, allowing a sandboxed process to execute arbitrary code in an unsandboxed host process. This issue is fixed in version 1.17.6.

CWE	CWE-284
Vendor	sandboxie-plus
Product	sandboxie
Published	Jul 15, 2026
Last Updated	Jul 16, 2026

Stay Ahead of the Next One

Get instant alerts for sandboxie-plus sandboxie

Be the first to know when new high vulnerabilities affecting sandboxie-plus sandboxie are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

sandboxie-plus / Sandboxie

< 1.17.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-rmv3-fhg3-75xh github.com: https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.17.6