[getgrav/grav] Code injection in grav

Grav is vulnerable to Server Side Template Injection via Twig. According to a previous vulnerability report, Twig should not render dangerous functions by default, such as system.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-2073
• https://github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83
• https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66
• https://github.com/advisories/GHSA-cxgw-r5jg-7xwq