diff --git a/backend/app/services/winrm_connect.py b/backend/app/services/winrm_connect.py
index 0ab33e1..d903dd2 100644
--- a/backend/app/services/winrm_connect.py
+++ b/backend/app/services/winrm_connect.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import base64
 import socket
 from dataclasses import dataclass
 
@@ -140,17 +141,37 @@ def run_winrm_logoff(*, target: str, user: str, password: str, session_id: int)
     )
 
 
+def _encode_powershell(script: str) -> str:
+    return base64.b64encode(script.encode("utf-16-le")).decode("ascii")
+
+
+def _powershell_literal_path(path: str) -> str:
+    return path.replace("'", "''")
+
+
 def _winrm_rdp_update_remote_cmd(script_path: str) -> str:
     script = script_path.strip()
     if script:
-        return f'powershell.exe -NoProfile -ExecutionPolicy Bypass -File "{script}"'
+        literal = _powershell_literal_path(script)
+        ps = (
+            f"$p = '{literal}'\n"
+            "if (-not (Test-Path -LiteralPath $p)) { throw 'Deploy script not found' }\n"
+            "& $p"
+        )
+    else:
+        ps = (
+            "$candidates = @(\n"
+            "  (Join-Path $env:ProgramData 'LoginMonitor\\Deploy-LoginMonitor.ps1'),\n"
+            "  (Join-Path $env:USERPROFILE 'Deploy-LoginMonitor.ps1')\n"
+            ")\n"
+            "$p = $candidates | Where-Object { Test-Path -LiteralPath $_ } | Select-Object -First 1\n"
+            "if (-not $p) { throw 'Deploy-LoginMonitor.ps1 not found' }\n"
+            "& $p"
+        )
+    encoded = _encode_powershell(ps)
     return (
-        "powershell.exe -NoProfile -ExecutionPolicy Bypass -Command "
-        '"& { $candidates = @('
-        "(Join-Path $env:ProgramData 'LoginMonitor' 'Deploy-LoginMonitor.ps1'),"
-        "(Join-Path $env:USERPROFILE 'Deploy-LoginMonitor.ps1')"
-        '); $p = $candidates | Where-Object { Test-Path $_ } | Select-Object -First 1; '
-        "if (-not $p) { throw 'Deploy-LoginMonitor.ps1 not found' }; & $p }'"
+        "powershell.exe -NoProfile -NonInteractive -ExecutionPolicy Bypass "
+        f"-EncodedCommand {encoded}"
     )
 
 
diff --git a/backend/app/version.py b/backend/app/version.py
index 90b6d12..6e6cf6d 100644
--- a/backend/app/version.py
+++ b/backend/app/version.py
@@ -1,5 +1,5 @@
 """Единый источник версии SAC (API, health, логи, OpenAPI)."""
 
 APP_NAME = "Security Alert Center"
-APP_VERSION = "0.20.9"
+APP_VERSION = "0.20.10"
 APP_VERSION_LABEL = f"{APP_NAME} v.{APP_VERSION}"
diff --git a/backend/tests/test_winrm_connect.py b/backend/tests/test_winrm_connect.py
new file mode 100644
index 0000000..fcad69d
--- /dev/null
+++ b/backend/tests/test_winrm_connect.py
@@ -0,0 +1,33 @@
+"""WinRM command builder tests."""
+
+import base64
+
+from app.services.winrm_connect import _winrm_rdp_update_remote_cmd
+
+
+def test_rdp_update_default_uses_encoded_command_without_broken_quotes():
+    cmd = _winrm_rdp_update_remote_cmd("")
+    assert "-EncodedCommand" in cmd
+    assert "-Command" not in cmd
+    assert '"& {' not in cmd
+
+    encoded = cmd.rsplit(" ", 1)[-1]
+    script = base64.b64decode(encoded).decode("utf-16-le")
+    assert "Deploy-LoginMonitor.ps1" in script
+    assert "Join-Path $env:ProgramData" in script
+
+
+def test_rdp_update_custom_script_uses_encoded_command():
+    cmd = _winrm_rdp_update_remote_cmd(r"C:\ProgramData\LoginMonitor\Deploy-LoginMonitor.ps1")
+    assert "-EncodedCommand" in cmd
+    encoded = cmd.rsplit(" ", 1)[-1]
+    script = base64.b64decode(encoded).decode("utf-16-le")
+    assert r"C:\ProgramData\LoginMonitor\Deploy-LoginMonitor.ps1" in script
+    assert "Test-Path -LiteralPath" in script
+
+
+def test_rdp_update_custom_script_escapes_single_quotes():
+    cmd = _winrm_rdp_update_remote_cmd(r"C:\Users\O'Brien\Deploy-LoginMonitor.ps1")
+    encoded = cmd.rsplit(" ", 1)[-1]
+    script = base64.b64decode(encoded).decode("utf-16-le")
+    assert "O''Brien" in script
diff --git a/frontend/src/version.ts b/frontend/src/version.ts
index b1d57b0..b7a865e 100644
--- a/frontend/src/version.ts
+++ b/frontend/src/version.ts
@@ -1,4 +1,4 @@
 /** Fallback до загрузки /health; при релизе держите в sync с backend/app/version.py */
 export const APP_NAME = "Security Alert Center";
-export const APP_VERSION = "0.20.9";
+export const APP_VERSION = "0.20.10";
 export const APP_VERSION_LABEL = `${APP_NAME} v.${APP_VERSION}`;