CVE-2018-8415 [High] | Code Injection in Powershell Core

A tampering vulnerability exists in PowerShell that could allow an attacker to execute unlogged code, aka "Microsoft PowerShell Tampering Vulnerability." This affects Windows 7, PowerShell Core 6.1, Windows Server 2012 R2, Windows RT 8.1, PowerShell Core 6.0, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.67%	1.19%	+0.52%
2	2026-05-31	0.63%	0.67%	+0.04%
3	2026-05-02	—	0.63%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.67%

1.19%

+0.52%

2026-05-31

0.63%

0.67%

+0.04%

2026-05-02

—

0.63%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.0	HIGH	`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]
4.6	2.0	MEDIUM	`AV:L/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	3.9	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.0

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

4.6

2.0

MEDIUM

AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

3.9

6.4

[email protected]

Affected software / configurations for CVE-2018-8415

Vendor	Product	Version	Raw CPE
microsoft	powershell_core	6.0	cpe:2.3:a:microsoft:powershell_core:6.0:::::::*
microsoft	powershell_core	6.1	cpe:2.3:a:microsoft:powershell_core:6.1:::::::*
microsoft	windows_10	—	cpe:2.3:o:microsoft:windows_10:-:::::::*
microsoft	windows_10	1607	cpe:2.3:o:microsoft:windows_10:1607:::::::*
microsoft	windows_10	1703	cpe:2.3:o:microsoft:windows_10:1703:::::::*
microsoft	windows_10	1709	cpe:2.3:o:microsoft:windows_10:1709:::::::*
microsoft	windows_10	1803	cpe:2.3:o:microsoft:windows_10:1803:::::::*
microsoft	windows_10	1809	cpe:2.3:o:microsoft:windows_10:1809:::::::*
microsoft	windows_7	—	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
microsoft	windows_8.1	—	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
microsoft	windows_rt_8.1	—	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
microsoft	windows_server_2008	r2	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1::::::
microsoft	windows_server_2012	—	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
microsoft	windows_server_2012	r2	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
microsoft	windows_server_2016	—	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*
microsoft	windows_server_2016	1709	cpe:2.3:o:microsoft:windows_server_2016:1709:::::::*
microsoft	windows_server_2016	1803	cpe:2.3:o:microsoft:windows_server_2016:1803:::::::*
microsoft	windows_server_2019	—	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

References for CVE-2018-8415

URL	Tags
http://www.securityfocus.com/bid/105792	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1042108	Third Party Advisory VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8415	Patch Vendor Advisory

URL

CVE-2018-8415

Exploit prediction scoring system (EPSS) score for CVE-2018-8415

Common vulnerability scoring system (CVSS) metrics for CVE-2018-8415

Weakness enumeration for CVE-2018-8415

Affected software / configurations for CVE-2018-8415

References for CVE-2018-8415