The repo was clean. You thought the history was settled. Then a single git rebase command shifted the ground under your feet.
Git rebase privilege escalation is not theory. It happens when rebase operations are combined with scripts, hooks, or system misconfigurations that give contributors more access than intended. This risk emerges in teams using shared repositories, CI/CD pipelines, or automated merge processes. A rebase rewrites history. If not controlled, it can rewrite permissions.
The escalation vector works like this:
A user with limited privileges creates commits that trigger privileged code paths—pre-commit hooks, post-rewrite hooks, or build scripts. When another user with higher privileges rebases those commits, Git executes the embedded scripts under the higher privilege context. The malicious code runs, granting the attacker unauthorized access.
Key triggers for git rebase privilege escalation:
- Misconfigured Git hooks in a shared environment
- Rebase operations on repositories with executable files committed by untrusted users
- CI/CD systems that automatically run scripts after rebase without sandboxing
- Weak access control for who can trigger or perform rebases on protected branches
Mitigations require strict control:
- Disable risky Git hooks or ensure they run in a reduced, non-privileged environment.
- Use signed commits and verify signatures before rebasing.
- Limit who can perform rebases on branches that affect production code.
- Enforce rebase in clean, audited environments rather than local developer machines with unknown state.
Security teams must treat rebase operations as rewriting both code and trust boundaries. If the execution context changes during a rebase, so can the attacker’s reach. This is not just a Git workflow detail. It is an operational security surface.
Watch the commit history. Audit the scripts. Control the hands allowed to rewrite it.
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