Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M

CVE-2026-45313Sandboxie-Plus: Sandboxie APC Injection Sandbox Escape

High 7.7

In plain English

A high-severity improper access control in Sandboxie from sandboxie-plus. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)0.2%top 95.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
sandboxie-plus	Sandboxie	< 1.17.6

Weakness: CWE-284 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

References

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