Physical circumstances determining eligibility for housing grants can be influenced by claimants---covering those is NOT ‘social security.’
Frans Pennings 18, Professor of Labour Law and Social Security Law, Utrecht University, the Netherlands and Martin Seeleib-Kaiser, Professor of Comparative Public Policy, Institute of Political Science, Eberhard Karls University of Tübingen, Germany, “Social Security,” Routledge Handbook of the Welfare State, edited by Bent Greve, 2nd ed., Routledge, 06/28/2018, pp. 355–365 DOI.org (Crossref), doi:10.4324/9781315207049-32
Study grants and housing benefits also provide for income compensation and could therefore be considered a form of social security. However, also for these risks the problem is that there is a choice for claimants to influence their materialisation; moreover, there can be different views on whether these risks should be collectively borne than in the case of the traditional risks.
This does not mean, of course, that states cannot make arrangements for such contingencies, but they fall outside the concept of social security generally used.