CVE-2026-55201
Evil-WinRM - Path Traversal in download_dir() Function
Description
Evil-WinRM through 3.9, fixed in commit 6ecd570, contains a path traversal vulnerability in the download_dir() function that allows a rogue or compromised remote Windows server to write files outside the intended download directory by returning filenames with traversal sequences from Get-ChildItem command output that are passed unsanitized to File.join(). Attackers controlling the remote server can exploit this to overwrite sensitive client-side files such as SSH authorized_keys or shell configuration files, achieving persistent access or privilege escalation on the client machine.
INFO
Published Date :
June 17, 2026, 8:17 p.m.
Last Modified :
Oct. 26, 2026, 12:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Evil-WinRM to a patched version.
- Ensure filenames are sanitized before joining.
- Validate remote server output for traversal sequences.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55201.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55201 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55201
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55201 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55201 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: evil-winrm de Hackplayers, Description: Evil-WinRM hasta la versión 3.9, corregido en el commit 6ecd570, contiene una vulnerabilidad de salto de ruta en la función download_dir() que permite a un servidor Windows remoto malicioso o comprometido escribir archivos fuera del directorio de descarga previsto al devolver nombres de archivo con secuencias de salto de ruta de la salida del comando Get-ChildItem que se pasan sin sanear a File.join(). Los atacantes que controlan el servidor remoto pueden explotar esto para sobrescribir archivos sensibles del lado del cliente, como los archivos SSH authorized_keys o los archivos de configuración del shell, logrando acceso persistente o escalada de privilegios en la máquina cliente. -
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/Hackplayers/evil-winrm', 'vendor': 'Hackplayers', 'product': 'evil-winrm', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '3.9'}, {'status': 'unaffected', 'version': '6ecd570a298562dc72ad73978307eb34182f5850', 'versionType': 'git'}], 'defaultStatus': 'unaffected'}] [{'repo': 'https://github.com/Hackplayers/evil-winrm', 'vendor': 'Hackplayers', 'product': 'evil-winrm', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '3.9'}, {'status': 'unaffected', 'version': '6ecd570a298562dc72ad73978307eb34182f5850', 'versionType': 'git'}], 'packageURL': 'pkg:github/Hackplayers/evil-winrm', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 18, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55201', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-18T13:49:52.347715Z'} -
New CVE Received by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/Hackplayers/evil-winrm', 'vendor': 'Hackplayers', 'product': 'evil-winrm', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '3.9'}, {'status': 'unaffected', 'version': '6ecd570a298562dc72ad73978307eb34182f5850', 'versionType': 'git'}], 'defaultStatus': 'unaffected'}] Added Description Evil-WinRM through 3.9, fixed in commit 6ecd570, contains a path traversal vulnerability in the download_dir() function that allows a rogue or compromised remote Windows server to write files outside the intended download directory by returning filenames with traversal sequences from Get-ChildItem command output that are passed unsanitized to File.join(). Attackers controlling the remote server can exploit this to overwrite sensitive client-side files such as SSH authorized_keys or shell configuration files, achieving persistent access or privilege escalation on the client machine. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Added CWE CWE-22 Added Reference https://github.com/Hackplayers/evil-winrm/commit/6ecd570a298562dc72ad73978307eb34182f5850 Added Reference https://github.com/Hackplayers/evil-winrm/pull/81 Added Reference https://www.vulncheck.com/advisories/evil-winrm-path-traversal-in-download-dir-function