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It was recently shown that the CFT dual of string theory on ${\rm AdS}_3\times {\rm S}^3 \times T^4$, the symmetric orbifold of $T^4$, contains aclosed higher spin subsector. Via holography, this makes precise the sense inwhich tensionless string theory on this background contains a Vasiliev higherspin theory. In this paper we study this phenomenon directly from theworldsheet. Using the WZW description of the background with pure NS-NS flux,we identify the states that make up the leading Regge trajectory and show thatthey fit into the even spin ${\cal N}=4$ Vasiliev higher spin theory. We alsoshow that these higher spin states do not become massless, except for thesomewhat singular case of level $k=1$ where the theory contains a stringy towerof massless higher spin fields coming from the long string sector.

Higher spins on AdS$_{3}$ from the worldsheet