Why Are My Unsigned PowerShell Scripts Running?

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Asked By CuriousDev123 On

I'm a bit confused about the PowerShell execution policy. A few years back, I couldn't run any scripts stored on our file share (whether I used the NETBIOS name or FQDN), due to the default execution policy being RemoteSigned, so I usually had to set it to Bypass. Recently, I've set up a signing certificate, published it via GPO, and signed my scripts. I've also enforced RemoteSigned through a GPO on my computer. But when I test an unsigned script from our file server, it runs without issue. What's going on here?

3 Answers

Answered By ScriptSavvy101 On

Looks like you're experiencing the normal behavior of the RemoteSigned policy. According to Microsoft's documentation, this policy allows scripts to run if they're locally created or unblocked. So if the scripts aren't marked as downloaded from the internet, they run fine, even if they're unsigned. It's crucial to manage how files are tagged when they transfer into your system.

Answered By TechWhiz990 On

Sounds like you might not have nailed down the execution policy settings. If you're messing around with Bypass and then switch it to RemoteSigned, be sure to double-check that everything is configured properly. Sometimes a GPO might not apply as expected, which can lead to confusion about what's actually running.

Answered By CodeSlinger88 On

This usually comes down to where your scripts are coming from. If PowerShell thinks the file is local and not from the internet, it won't require a signature to run it. If your file server or domain is set up in the local intranet zone, then those scripts are treated as local, which is why the unsigned scripts are running.

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