From 68a0348c2068d85d2d735c8655f72bafe32d4c5d Mon Sep 17 00:00:00 2001
From: ant-soumitr <soumitr@anthropic.com>
Date: Mon, 8 Dec 2025 12:08:44 -0800
Subject: [PATCH] fix: Replace direct template expansion of inputs in shell
 scripts with environment variables (#729)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replace direct template expansion of user inputs in shell scripts with
environment variables to prevent potential command injection attacks.

Changes:
- sync-base-action.yml: Use $GITHUB_EVENT_NAME and $GITHUB_ACTOR instead of template expansion
- action.yml: Pass path_to_bun_executable and path_to_claude_code_executable through env vars
- base-action/action.yml: Same env var changes for path inputs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>
---
 .github/workflows/sync-base-action.yml |  4 ++--
 action.yml                             | 14 +++++++++-----
 base-action/action.yml                 | 14 +++++++++-----
 3 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/sync-base-action.yml b/.github/workflows/sync-base-action.yml
index 32ba9b4..72bf8c0 100644
--- a/.github/workflows/sync-base-action.yml
+++ b/.github/workflows/sync-base-action.yml
@@ -94,5 +94,5 @@ jobs:
           echo "✅ Successfully synced \`base-action\` directory to [anthropics/claude-code-base-action](https://github.com/anthropics/claude-code-base-action)" >> $GITHUB_STEP_SUMMARY
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "- **Source commit**: [\`${GITHUB_SHA:0:7}\`](https://github.com/anthropics/claude-code-action/commit/${GITHUB_SHA})" >> $GITHUB_STEP_SUMMARY
-          echo "- **Triggered by**: ${{ github.event_name }}" >> $GITHUB_STEP_SUMMARY
-          echo "- **Actor**: @${{ github.actor }}" >> $GITHUB_STEP_SUMMARY
+          echo "- **Triggered by**: $GITHUB_EVENT_NAME" >> $GITHUB_STEP_SUMMARY
+          echo "- **Actor**: @$GITHUB_ACTOR" >> $GITHUB_STEP_SUMMARY
diff --git a/action.yml b/action.yml
index b957527..1175014 100644
--- a/action.yml
+++ b/action.yml
@@ -140,10 +140,12 @@ runs:
     - name: Setup Custom Bun Path
       if: inputs.path_to_bun_executable != ''
       shell: bash
+      env:
+        PATH_TO_BUN_EXECUTABLE: ${{ inputs.path_to_bun_executable }}
       run: |
-        echo "Using custom Bun executable: ${{ inputs.path_to_bun_executable }}"
+        echo "Using custom Bun executable: $PATH_TO_BUN_EXECUTABLE"
         # Add the directory containing the custom executable to PATH
-        BUN_DIR=$(dirname "${{ inputs.path_to_bun_executable }}")
+        BUN_DIR=$(dirname "$PATH_TO_BUN_EXECUTABLE")
         echo "$BUN_DIR" >> "$GITHUB_PATH"
 
     - name: Install Dependencies
@@ -182,6 +184,8 @@ runs:
     - name: Install Base Action Dependencies
       if: steps.prepare.outputs.contains_trigger == 'true'
       shell: bash
+      env:
+        PATH_TO_CLAUDE_CODE_EXECUTABLE: ${{ inputs.path_to_claude_code_executable }}
       run: |
         echo "Installing base-action dependencies..."
         cd ${GITHUB_ACTION_PATH}/base-action
@@ -190,7 +194,7 @@ runs:
         cd -
 
         # Install Claude Code if no custom executable is provided
-        if [ -z "${{ inputs.path_to_claude_code_executable }}" ]; then
+        if [ -z "$PATH_TO_CLAUDE_CODE_EXECUTABLE" ]; then
           CLAUDE_CODE_VERSION="2.0.61"
           echo "Installing Claude Code v${CLAUDE_CODE_VERSION}..."
           for attempt in 1 2 3; do
@@ -210,9 +214,9 @@ runs:
           echo "Claude Code installed successfully"
           echo "$HOME/.local/bin" >> "$GITHUB_PATH"
         else
-          echo "Using custom Claude Code executable: ${{ inputs.path_to_claude_code_executable }}"
+          echo "Using custom Claude Code executable: $PATH_TO_CLAUDE_CODE_EXECUTABLE"
           # Add the directory containing the custom executable to PATH
-          CLAUDE_DIR=$(dirname "${{ inputs.path_to_claude_code_executable }}")
+          CLAUDE_DIR=$(dirname "$PATH_TO_CLAUDE_CODE_EXECUTABLE")
           echo "$CLAUDE_DIR" >> "$GITHUB_PATH"
         fi
 
diff --git a/base-action/action.yml b/base-action/action.yml
index d6262d7..26c22b7 100644
--- a/base-action/action.yml
+++ b/base-action/action.yml
@@ -101,10 +101,12 @@ runs:
     - name: Setup Custom Bun Path
       if: inputs.path_to_bun_executable != ''
       shell: bash
+      env:
+        PATH_TO_BUN_EXECUTABLE: ${{ inputs.path_to_bun_executable }}
       run: |
-        echo "Using custom Bun executable: ${{ inputs.path_to_bun_executable }}"
+        echo "Using custom Bun executable: $PATH_TO_BUN_EXECUTABLE"
         # Add the directory containing the custom executable to PATH
-        BUN_DIR=$(dirname "${{ inputs.path_to_bun_executable }}")
+        BUN_DIR=$(dirname "$PATH_TO_BUN_EXECUTABLE")
         echo "$BUN_DIR" >> "$GITHUB_PATH"
 
     - name: Install Dependencies
@@ -115,8 +117,10 @@ runs:
 
     - name: Install Claude Code
       shell: bash
+      env:
+        PATH_TO_CLAUDE_CODE_EXECUTABLE: ${{ inputs.path_to_claude_code_executable }}
       run: |
-        if [ -z "${{ inputs.path_to_claude_code_executable }}" ]; then
+        if [ -z "$PATH_TO_CLAUDE_CODE_EXECUTABLE" ]; then
           CLAUDE_CODE_VERSION="2.0.61"
           echo "Installing Claude Code v${CLAUDE_CODE_VERSION}..."
           for attempt in 1 2 3; do
@@ -135,9 +139,9 @@ runs:
           done
           echo "Claude Code installed successfully"
         else
-          echo "Using custom Claude Code executable: ${{ inputs.path_to_claude_code_executable }}"
+          echo "Using custom Claude Code executable: $PATH_TO_CLAUDE_CODE_EXECUTABLE"
           # Add the directory containing the custom executable to PATH
-          CLAUDE_DIR=$(dirname "${{ inputs.path_to_claude_code_executable }}")
+          CLAUDE_DIR=$(dirname "$PATH_TO_CLAUDE_CODE_EXECUTABLE")
           echo "$CLAUDE_DIR" >> "$GITHUB_PATH"
         fi