CVE-2016-3387

HIGH

Microsoft Internet Explorer 10-11 and Edge - Elevation of Privilege via Private Namespace Access

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-3387. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit demonstrates an elevation of privilege vulnerability in Windows 10 Edge/IE by creating an isolated private namespace with an insecure boundary descriptor. The PoC allows non-appcontainer processes to gain elevated permissions on the namespace directory, potentially leading to privilege escalation.

Description

Microsoft Internet Explorer 10 and 11 and Microsoft Edge do not properly restrict access to private namespaces, which allows remote attackers to gain privileges via unspecified vectors, aka "Microsoft Browser Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-3388.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · c++localwindows
https://www.exploit-db.com/exploits/40607

This exploit demonstrates an elevation of privilege vulnerability in Windows 10 Edge/IE by creating an isolated private namespace with an insecure boundary descriptor. The PoC allows non-appcontainer processes to gain elevated permissions on the namespace directory, potentially leading to privilege escalation.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Edge/Internet Explorer on Windows 10 10586
Auth required
Prerequisites: Access to a non-appcontainer sandbox process · Edge/IE not already running · Ability to execute code as another user
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (6)

Core 6
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1036993
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/40607/
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1036992
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/93381

Scores

CVSS v3 7.5
EPSS 0.3335
EPSS Percentile 97.0%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-264
Status published
Products (3)
microsoft/edge
microsoft/internet_explorer 10
microsoft/internet_explorer 11
Published Oct 14, 2016
Tracked Since Feb 18, 2026