From f6fb9d698e4532b30c22683efd00c8e505abf38d Mon Sep 17 00:00:00 2001
From: cui <cuiweixie@gmail.com>
Date: Wed, 1 Apr 2026 01:08:09 +0800
Subject: [PATCH] PSStyle: validate background index against
 `BackgroundColorMap` (#27106)

---
 .../FormatAndOutput/common/PSStyle.cs                           | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs b/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
index 3f927afd7d5..534f9541195 100644
--- a/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
+++ b/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
@@ -892,7 +892,7 @@ public static string MapColorPairToEscapeSequence(ConsoleColor foregroundColor,
                 throw new ArgumentOutOfRangeException(paramName: nameof(foregroundColor));
             }
 
-            if (backIndex < 0 || backIndex >= ForegroundColorMap.Length)
+            if (backIndex < 0 || backIndex >= BackgroundColorMap.Length)
             {
                 throw new ArgumentOutOfRangeException(paramName: nameof(backgroundColor));
             }