A remote code execution (RCE) vulnerability in Gitbutler, a popular Git client, allows attackers to execute arbitrary commands simply by tricking a victim into clicking a specially crafted link. The flaw, discovered by security researcher Robbe Verwilghen, stems from improper sanitization of link injections via forge integrations (e.g., GitHub, GitLab, or Bitbucket). When a user with Gitbutler version below 0.19.7 clicks such a link, the client executes embedded script payloads with the user’s privileges. This underscores how modern development tools that blend local Git operations with cloud forge APIs can become vectors for supply‑chain attacks.
Learning Objectives
Understand how link injection leads to RCE in version control clients that integrate with forges.
Learn to identify vulnerable Gitbutler versions and apply mitigations on Linux and Windows.
Implement hardened Git client configuration, forge API security controls, and incident response steps.
You Should Know
1. How Link Injection Bypasses Gitbutler’s Input Validation
The vulnerability leverages a forge integration feature that automatically renders links from issue trackers, pull requests, or commit comments. Gitbutler fetches rich text from the forge (e.g., HTML‑formatted descriptions) and displays it within the application. Due to insufficient output encoding, an attacker can inject a malicious `
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