Revoke or rotate the exposed credential with the provider first. Removing it from the latest version of a file does not invalidate the value, and rewriting Git history cannot guarantee that copies are gone. Then replace the credential wherever it is used, investigate possible access during the exposure window, and decide whether cleaning repository history is worthwhile.
What to do first after committing a secret
- Identify and scope the exposure. Note the credential type and issuing provider, repository, affected file and commit, who owns it, whether the repository was public, whether the value is still active, what permissions it grants, and which services use it. GitHub suggests using repository ownership information and
git log -Sto help find the change that introduced a value. Do not paste the secret into an issue, ticket, or chat while investigating. See GitHub’s leaked-secret response tutorial. - Contain the credential at its source. Treat a leaked value as compromised, especially if it is active, production-scoped, or was committed to a public repository. Revoke it or rotate it through the issuing provider. For a high-risk credential, prioritize invalidation. If an immediate change would cause an outage and the provider supports safe overlap, create a replacement, switch dependent services, verify they work, and then disable the old value. Follow the provider’s current procedure.
- Replace it everywhere it is used. Update applications, deployments, CI jobs, repository or environment secrets, and integrations that relied on the old credential. Store the replacement in managed secrets storage or inject it at runtime rather than committing it to source. Test affected services using the new value. GitHub’s response tutorial and AWS’s remediation guidance describe these response principles.
- Check for misuse and impact. Review repository-host audit or security logs and the provider’s audit records for the exposure period. Investigate activity in light of the credential’s actual permissions; rotation does not undo unauthorized reads, writes, or persistence.
- Decide whether to clean Git history. Removing the value from the current file does not remove it from earlier commits. Once the credential is invalidated, weigh history rewriting against its collaboration costs and the possibility that forks or clones retain the original. Treat history cleanup as exposure reduction, not as a substitute for revocation.
- Verify remediation and reduce recurrence risk. Resolve relevant secret-scanning alerts, scan the repository history and other relevant surfaces, and continue monitoring logs. Where feasible, replace long-lived credentials with short-lived credentials, roles, or federation, and use secret scanning or push protection.
Is deleting the secret in a new commit enough?
No. A new commit changes the current version of the file, but the earlier commit can still contain the credential. More importantly, deleting the text does not disable the credential at the provider. GitHub Docs advises: “You should consider any leaked secret to be immediately compromised and it is essential that you undertake proper remediation steps, such as revoking the secret.” GitHub Docs: Remediating a leaked secret in your repository.
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Revoke or rotate the value with its issuer. History cleanup may reduce future exposure in the main repository, but copies, forks, caches, or clones can remain. GitHub explains the implications in its sensitive-data removal guidance.
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The right sequence depends on the risk and on whether the provider permits a safe transition. A public exposure or a credential with broad production permissions favors rapid invalidation. If disabling it immediately would interrupt a critical service, first check whether the provider supports two active credentials or another overlap mechanism. If it does, issue the replacement, move and test each dependent service, then revoke the exposed value. Do not assume every provider offers overlap or that keeping a compromised credential active is safe; use that approach only when the provider’s controls and the incident risk justify it. The GitHub tutorial and AWS exposed-key response provide response guidance.
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How to investigate whether the credential was used
Establish the likely exposure window: when the secret entered Git, when it was pushed or otherwise shared, and when it was invalidated. Then use the logs available from the repository host and the service that issued the credential. A private repository narrows who could access it, but does not establish that the value was safe; consider who had access and whether it was shared through other channels.
- Check provider-side audit records for activity attributable to the credential, where the provider records it.
- Compare activity with the credential’s permissions and expected use. Investigate unusual reads, writes, authentication events, or configuration changes.
- For an exposed AWS access key, AWS recommends inspecting CloudTrail and relevant S3 logs, assessing the key’s permissions, and considering persistence or temporary credentials derived from it. Disabling the originating key does not necessarily invalidate temporary credentials that were already issued. Follow AWS’s exposed-key response and review its remediation guidance.
- If the credential could write or change data, assess data integrity and restore from a trusted source if needed. For broader incident-response steps, consult GitHub’s incident-response guide.
When to rewrite Git history
History rewriting can remove the secret from reachable commits in the repository you control, reducing the chance that someone encounters it there later. It is a separate cleanup step after the credential has been revoked or rotated. It does not make a disclosed credential safe, and it cannot ensure removal from forks, clones, or other copies.
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Before rewriting, coordinate with collaborators. The operation can change commit history and require a force-push; collaborators may need to rebase or reclone, and stale copies can reintroduce the old history. GitHub’s removal guidance covers repository considerations, while AWS names git filter-repo in its exposed-secret guidance. Follow the host’s current instructions, particularly if the secret appears in more than one commit or repository location.
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Prevent another accidental commit
- Keep required secrets out of source files. Use a managed secrets facility or runtime injection, and limit each credential to the permissions it needs.
- Prefer short-lived credentials, roles, or federation over long-lived static keys where the provider and workload support them. AWS discusses this approach in its Well-Architected security guidance.
- Enable repository secret scanning and, where available, push protection or a pre-commit check. GitHub describes its capabilities in the secret-scanning overview; availability can vary by plan and configuration.
- After remediation, confirm alerts are resolved and continue monitoring relevant audit logs for suspicious activity.
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