Prevents a potential security issue when expression
nodes are used to output variables, in which case,
they would not be properly escaped.

The fix implements escaping interception for these
expression nodes.

https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C