Relative Path Traversal in PowerShell - CVE-2026-70337
Published: August 12, 2026
Vulnerability identifier: #VU142003
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70337
CWE-ID: CWE-23
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to relative path traversal in Microsoft PowerShell Core when processing a server response from a malicious server. A remote attacker can host a malicious server and convince a user to connect to it to execute arbitrary code.
User interaction is required.
Affected software
PowerShell
How to mitigate CVE-2026-70337
Install security update from vendor's website.
PowerShell - update to 7.4.19.0