From 5e10bc06cdae3afdf6b3ca935b8a85b820c48464 Mon Sep 17 00:00:00 2001
From: Aiqiao Yan <55104035+aiqiaoy@users.noreply.github.com>
Date: Tue, 7 Jul 2026 16:34:58 -0400
Subject: backport `allow-unsafe-pr-checkout` to v6 (#2500)

* block checking out fork pr for pull_request_target and workflow_run (#2454)

* block checking out fork pr for some events

* address copilot and reviewer feedback

* run prettier formatting

* build

* update urls

* update readme

* update description and url again

* edit url one more time

* update error wording (#2467)
---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'README.md')

diff --git a/README.md b/README.md
index f0f65f9..240c4b6 100644
--- a/README.md
+++ b/README.md
@@ -160,6 +160,15 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     # running from unless specified. Example URLs are https://github.com or
     # https://my-ghes-server.example.com
     github-server-url: ''
+
+    # Required to check out fork pull request code from a workflow triggered by
+    # `pull_request_target` or `workflow_run`. These workflows run with the base
+    # repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner
+    # access; fetching and executing a fork's code in that trusted context commonly
+    # leads to "pwn request" vulnerabilities. Set to `true` only after reviewing the
+    # risks at https://gh.io/securely-using-pull_request_target.
+    # Default: false
+    allow-unsafe-pr-checkout: ''
 ```
 <!-- end usage -->
 
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