CVE-2016-3387
Microsoft Internet Explorer 10 and 11 and Microsoft Edge do not properly restrict access to...
CVE-2016-3387 is a high vulnerability (CVSS 7.5) in Microsoft Edge, published October 14, 2016. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 19.9%, the 97th percentile. No source names a fixed version.
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2016-3387- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-264
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2016-3387- Updated
- 2026-11-02
EUVDEUVD-2016-4415 No score
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.
- Record
EUVD-2016-4415- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-65wq-h5m6-882f
Microsoft Internet Explorer 10 and 11 and Microsoft Edge do not properly restrict access to...
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.
- Record
GHSA-65wq-h5m6-882f- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Microsoft Windows Edge/Internet Explorer - Isolated Private Namespace Insecure Boundary Descriptor Privilege Escalation (MS16-118) | 2016-10-20 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, Exploit-DB, GitHub Advisories, NVD |
References
docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-119
securitytracker.com/id/1036993
exploit-db.com/exploits/40607
securityfocus.com/bid/93381
nvd.nist.gov/vuln/detail/CVE-2016-3387
github.com/advisories/GHSA-65wq-h5m6-882f