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We devise a new user-friendly tool interfaced with the Boltzmann code CLASSto deal with any kind of exotic electromagnetic energy injection in theuniverse and its impact on anisotropies of the Cosmic Microwave Background. Itmakes use of the results from standard electromagnetic cascade calculationsdevelop in the context of WIMP annihilation, generalized to incorporate anyinjection history. We first validate it on a specific WIMP scenario, the HiggsPortal model, confirming that the standard effective on-the-spot treatment isaccurate enough. We then analyze the more involved example of evaporatingPrimordial Black Holes (PBHs) with masses in the range$[3\times10^{13},5\times10^{16}]$g, for which the standard approximations breakdown. We derive robust CMB bounds on the relic density of evaporating PBHs,ruling out the possibility for PBHs with a monochromatic distribution of massesin the range $[3\times10^{13},2.5\times10^{16}]$g to represent all of the DarkMatter in our Universe. Remarkably, we confirm with an accurate study that theCMB bounds are several orders of magnitude stronger than those from thegalactic gamma-ray background in the range $[3\times10^{13},3\times10^{14}]$g.A future CMB experiment like CORE+, or an experiment attempting at measuringthe 21 cm signal from the Dark Ages could greatly improve the sensitivity tothese models.

Exotic energy injection with ExoCLASS: Application to the Higgs portal model and evaporating black holes