Please report security problems through GitHub's private vulnerability reporting ("Report a vulnerability" on the Security tab), not in a public issue. Include the mod, the exact command or file text, and what you expected the mod to do.
In scope: an ordinary command or edit that a guard should deny but lets through, a mod that sends or writes data it should not (for example tf-plan-summary returning an attribute value), and a mod that fails open when it errors.
Out of scope: the limits listed under "Known limits" in the README, such as commands assembled at run time from variables or scripts. The mods are guardrails against an agent's mistakes, not a security boundary.