CVE-2023-37897

Summary

CVE-2023-37897: A new server-side template injection (SSTI) vulnerability affects the Grav web platform, built in PHP. This issue stems from a flawed fix for an earlier SSTI vulnerability, introduced in commit `71bbed1`. The incorrect implementation of the `isDangerousFunction()` check leads to bypass of the denylist, enabling payload execution through the use of double backslashes (`\\\\`). This vulnerability can potentially be exploited by attackers who have Administrator access or non-administrator accounts with Admin panel access and Create/Update page permissions. A fix has been implemented in commit `b4c6210` and is available in release version `1.7.42.2`. It is strongly recommended that users upgrade as soon as possible, as there are currently no known workarounds for this issue.

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