CVE-2026-45313 | Sandboxie-Plus is an open source sandbox-based isolation sof… | CVSS 7.7 HIGH

Description

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.

Metadata

CVE ID: CVE-2026-45313
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-11 20:50 UTC
Published: 2026-07-15 21:21 UTC
Last updated: 2026-07-15 21:21 UTC
Primary CWE: CWE-284
CWE-284: Improper Access Control
Vendor / Product: sandboxie-plus / Sandboxie
Sources: cve.org · NVD

Severity & Metrics

7.7 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
sandboxie-plus	Sandboxie	—	< 1.17.6

Weakness (CWE)

CWE	Source	Description
CWE-284	cna	CWE-284: Improper Access Control

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.7	HIGH	3.1	cna	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

References (2)

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