diff --git a/src/functions/TestResults.ps1 b/src/functions/TestResults.ps1
index dd3404d0d..42b3d041a 100644
--- a/src/functions/TestResults.ps1
+++ b/src/functions/TestResults.ps1
@@ -468,10 +468,10 @@ function Get-RunTimeEnvironment {
     $computerName = $env:ComputerName
     $userName = $env:Username
     if ($null -ne $SafeCommands['Get-CimInstance']) {
-        $osSystemInformation = (& $SafeCommands['Get-CimInstance'] Win32_OperatingSystem)
+        $osSystemInformation = (& $SafeCommands['Get-CimInstance'] Win32_OperatingSystem -ErrorAction Ignore)
     }
     elseif ($null -ne $SafeCommands['Get-WmiObject']) {
-        $osSystemInformation = (& $SafeCommands['Get-WmiObject'] Win32_OperatingSystem)
+        $osSystemInformation = (& $SafeCommands['Get-WmiObject'] Win32_OperatingSystem -ErrorAction Ignore)
     }
     elseif ($IsMacOS -or $IsLinux) {
         $osSystemInformation = @{
@@ -492,7 +492,9 @@ function Get-RunTimeEnvironment {
             # well, we tried
         }
     }
-    else {
+
+    # Fall back to unknown values if WMI/CIM returned null (e.g. access denied when not running as Administrator)
+    if ($null -eq $osSystemInformation) {
         $osSystemInformation = @{
             Name    = 'Unknown'
             Version = '0.0.0.0'
diff --git a/tst/functions/TestResults.Tests.ps1 b/tst/functions/TestResults.Tests.ps1
index e8442df3b..07bffe474 100644
--- a/tst/functions/TestResults.Tests.ps1
+++ b/tst/functions/TestResults.Tests.ps1
@@ -91,4 +91,28 @@ InPesterModuleScope {
         Pop-Location
 
     }
+
+    # Regression test for https://github.com/pester/Pester/issues/2678
+    # Get-CimInstance can fail with access denied when not running as Administrator.
+    # The fix adds -ErrorAction Ignore and a fallback to prevent the entire test report
+    # from failing just because OS info is unavailable.
+    Describe "Get-RunTimeEnvironment" {
+        It "Returns a hashtable with expected keys without throwing" {
+            $result = Get-RunTimeEnvironment
+            $result | Should -BeOfType [hashtable]
+            $result.Keys | Should -Contain 'os-version'
+            $result.Keys | Should -Contain 'platform'
+            $result.Keys | Should -Contain 'machine-name'
+            $result.Keys | Should -Contain 'user'
+            $result.Keys | Should -Contain 'cwd'
+            $result.Keys | Should -Contain 'clr-version'
+        }
+
+        It "Returns non-null os-version and platform values" {
+            # Even with access denied, the fallback should provide 'Unknown' / '0.0.0.0'
+            $result = Get-RunTimeEnvironment
+            $result['os-version'] | Should -Not -BeNullOrEmpty
+            $result['platform'] | Should -Not -BeNullOrEmpty
+        }
+    }
 }