GHSA-hmqg-cxww-wqhq

### Impact

PHP_CodeSniffer versions before v3.13.6 and v4.0.2 contain a command injection vulnerability in the code creating the `Gitblame`, `Hgblame` and `Svnblame` report(s).

As a result, running PHP_CodeSniffer over untrusted files, for example, in a CI pipeline that scans pull requests, or on a developer machine reviewing third-party code, could result in attacker-controlled shell commands being executed when the `Gitblame`, `Hgblame` or `Svnblame` report(s) would process a file whose name contains shell metacharacters.

* Users using the default `Full` report, or any of the other non-*blame reports, are not affected. * Users on a runtime platform which does not allow filenames to contain shell metacharacters, such as `"` and `;`, are not affected.

### Patched versions

The issue has been fixed in PHP_CodeSniffer v3.13.6 and v4.0.2. We recommend all users upgrade to these versions at their earliest convenience.

### Workaround

Users of PHP_CodeSniffer who cannot upgrade immediately should ensure they do not use the `Gitblame`, `Hgblame` or the `Svnblame` reports when scanning untrusted code.

This is especially relevant for CI jobs, pre-commit or review tooling, automated review services, and any service that scans untrusted repositories or uploaded source trees.

### Credits

Many thanks to both [@Faze-up](https://github.com/Faze-up) and [@edorian](https://github.com/edorian) for responsibly disclosing this vulnerability.

### How can I report a security bug?

Please report security vulnerabilities privately via [the "Security and quality" tab on the PHP_CodeSniffer repository](https://github.com/PHPCSStandards/PHP_CodeSniffer/security).