The language is not unambiguous; it's exactly ambiguous (you and your first reply demonstrate how hard it can be to see the other reading):

0. "find issues that are both critical and related to X"

...could be read as "issues that are X and are Y":

1. [valid, intended] find [all] issues that are[, at the same time,] 1) critical; and 2) related to X

...or as "issues, both of which issues are X and are Y":

2. [valid, your reading] find [an to-be-specified number of] issues that are, both [so I want two issues], possessing X and Y attributes.