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We analyzed the photometry of 20038 cool stars from campaigns 12, 13, 14 and15 of the K2 mission in order to detect, characterize and validate newplanetary candidates transiting low-mass stars. We present a catalogue of 25new periodic transit-like signals in 22 stars, of which we computed theparameters of the stellar host for 19 stars and the planetary parameters for 21signals. We acquired speckle and AO images, and also inspected archivalPan-STARRS1 images and Gaia DR2 to discard the presence of close stellarcompanions and to check possible transit dilutions due to nearby stars. Falsepositive probability (FPP) was computed for 22 signals, obtaining FPP < $1\%$for 17. We consider 12 of them as statistically validated planets. One signalis a false positive and the remaining 12 signals are considered as planetcandidates. 20 signals have orbital period P$_{\rm orb} < 10$ $d$, 2 have $10$$d < $ P$_{\rm orb} < 20$ $d$ and 3 have P$_{\rm orb} > 20$ $d$. Regardingradii, 11 candidates and validated planets have computed radius R $<2R_{\oplus}$, 9 have $2 R_{\oplus} <$ R $< 4 R_{\oplus}$, and 1 has R $>4R_{\oplus}$. 2 validated planets and 2 candidates are located in moderatelybright stars ($m_{kep}<13$) and 2 validated planets and 3 candidates havederived orbital radius within the habitable zone according to optimisticmodels. Of special interest is the validated warm super-Earth EPIC 248616368b(T$\rm_{eq} = 318^{+24}_{-43} \, K$, S$_{\rm p} = 1.7\pm 0.2 \, S_{\oplus}$,R$_{\rm p} = 2.1\pm 0.1 \, R_{\oplus} $), located in a m$\rm_{kep}$ = 14.13star.

Planetary candidates transiting cool dwarf stars from Campaigns 12 to 15 of K2