Cacti provides an operational monitoring and fault management framework. A command injection vulnerability on the 1.3.x DEV branch allows any unauthenticated user to execute arbitrary command on the server when `register_argc_argv` option of PHP is `On`. In `cmd_realtime.php` line 119, the `$poller_id` used as part of the command execution is sourced from `$_SERVER['argv']`, which can be controlled by URL when `register_argc_argv` option of PHP is `On`. And this option is `On` by default in many environments such as the main PHP Docker image for PHP. Commit 53e8014d1f082034e0646edc6286cde3800c683d contains a patch for the issue, but this commit was reverted in commit 99633903cad0de5ace636249de16f77e57a3c8fc.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-29895
https://www.cve.org/CVERecord?id=CVE-2024-29895
https://github.com/Cacti/cacti/blob/501712998589763d411a68d35e3cda98fd9cfd18/cmd_realtime.php#L119
https://github.com/Cacti/cacti/commit/53e8014d1f082034e0646edc6286cde3800c683d
https://github.com/Cacti/cacti/commit/99633903cad0de5ace636249de16f77e57a3c8fc
https://github.com/Cacti/cacti/security/advisories/GHSA-cr28-x256-xf5m