Leaked AWS Access Key: Immediate Steps & Long-Term Fixes

If your AWS access key is leaked, you must immediately deactivate the key, rotate it, and review your AWS environment for unauthorized activity. Time is critical — within minutes, attackers can spin up expensive resources, exfiltrate data, or create backdoor accounts. Here is the exact step-by-step playbook.

What Is a Leaked AWS Access Key?

A leaked AWS access key means your AWS Access Key ID and Secret Access Key have been exposed to unauthorized parties. This typically happens when the key is hardcoded in source code, committed to a public GitHub repo, stored in a client-side JavaScript file, or left in an unsecured .env file. Once leaked, anyone with the key can make API calls as if they were you — launching EC2 instances, reading S3 buckets, deleting databases, or racking up huge bills.

What to Do When Your AWS Access Key Is Leaked: Immediate Steps

Step 1: Deactivate the Leaked Key

This stops the key from working immediately, but existing sessions may remain active for up to 15 minutes.

Step 2: Review CloudTrail for Unauthorized Activity

Check AWS CloudTrail for API calls made with the compromised key:

# Using AWS CLI to find recent calls by the compromised key
aws cloudtrail lookup-events --lookup-attributes AttributeKey=AccessKeyId,AttributeValue=AKIAIOSFODNN7EXAMPLE --start-time 2025-01-01

Look for unusual actions like:

Step 3: Rotate the Key and Update Applications

After deactivating the leaked key, you need to create a new one and update all applications using it.

Important: If your app is deployed on Vercel, you must update environment variables there. If using GitHub Actions, update repository secrets. For a vibe-coded app built with Cursor or Bolt.new, check for hardcoded keys in the codebase.

# Example: Update GitHub Actions secret
# Go to Settings > Secrets and variables > Actions > Update AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY

Step 4: Remove the Leaked Key from All Locations

Search your entire codebase for the leaked key:

grep -r "AKIAIOSFODNN7EXAMPLE" .
grep -r "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY" .

Also check:

Step 5: Secure Your AWS Account

How to Prevent Future Leaks

Use AWS Secrets Manager or Parameter Store

Never hardcode keys. Fetch them at runtime:

import boto3
from botocore.exceptions import ClientError

def get_secret():
    session = boto3.session.Session()
    client = session.client(service_name='secretsmanager')
    try:
        response = client.get_secret_value(SecretId='prod/aws-keys')
        return response['SecretString']
    except ClientError as e:
        raise e

Implement Automated Scanning

Use tools like OverMCP to scan your GitHub repos, CI/CD pipelines, and deployed apps for leaked keys before they cause damage. OverMCP detects hardcoded secrets in AI-generated code and provides actionable fixes.

Set Up IAM Permissions Boundaries

Even if a key is leaked, a permissions boundary limits what the attacker can do:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": ["s3:GetObject"],
      "Resource": ["arn:aws:s3:::my-bucket/*"]
    }
  ]
}

Use Git Hooks to Prevent Committing Secrets

Add a pre-commit hook that scans for patterns:

#!/bin/sh
# .git/hooks/pre-commit
if git diff --cached | grep -qE "(AKIA[0-9A-Z]{16}|aws_secret_access_key)"; then
    echo "ERROR: AWS key detected in commit. Aborting."
    exit 1
fi

Real-World Example: The $4,500 Bitcoin Mining Surprise

A solo developer built a SaaS app with Bolt.new and deployed on Vercel. They accidentally committed an .env file containing their AWS keys to a public GitHub repo. Within hours, an automated bot detected the keys and launched 20 GPU instances for cryptocurrency mining. The developer received a $4,500 AWS bill the next day. By rotating the key immediately and using OverMCP to scan the repo, they stopped the attack and prevented recurrence.

FAQ

How do I know if my AWS access key is leaked?

Check AWS CloudTrail for API calls from unfamiliar IP addresses or regions. You can also use GitHub's secret scanning alerts or a tool like OverMCP to scan your codebase. Unexpected AWS bills or new resources you didn't create are strong indicators.

Can I reuse the same access key ID with a new secret key?

No. Once a key is leaked, you must deactivate the entire access key pair and generate a new one. The old key ID is considered compromised even if you change the secret key. Always create a new access key.

What should I do if I can't rotate the key immediately?

If you cannot access the AWS console or rotate the key right away, you can use the AWS CLI to delete the key remotely:

aws iam delete-access-key --user-name your-user --access-key-id AKIAIOSFODNN7EXAMPLE

If you don't have CLI access, contact AWS Support immediately to have the key disabled. Every minute counts.