Read-only Actions cache for untrusted triggers

UpdateJun 26, 2026VerifiedAdded Sep 22, 2026

GitHub Actions now issues read-only cache tokens to the default branch for workflow events that can be triggered without write permissions to the repository. This applies least privilege to the cache and prevents common privilege-escalation paths through cache poisoning.

Security Developer tools

Read GitHub's release notes

https://github.blog/changelog/2026-06-26-read-only-actions-cache-for-untrusted-triggers

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