Grav is a file-based Web-platform built in PHP. Grav is subject to a server side template injection (SSTI) vulnerability. The fix for another SSTI vulnerability using `|map`, `|filter` and `|reduce` twigs implemented in the commit `71bbed1` introduces bypass of the denylist due to incorrect return value from `isDangerousFunction()`, which allows to execute the payload prepending double backslash (`\`). The `isDangerousFunction()` check in version 1.7.42 and onwards retuns `false` value instead of `true` when the “ symbol is found in the `$name`. This vulnerability can be exploited if the attacker has access to: 1. an Administrator account, or 2. a non-administrator, user account that has Admin panel access and Create/Update page permissions. A fix for this vulnerability has been introduced in commit `b4c6210` and is included in release version `18.104.22.168`. Users are advised to upgrade. There are no known workarounds for this vulnerability.
.This CVE has a CVSS3.1 score of 7.2 and a Base Severity of HIGH.
References for CVE-2023-37897 :
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