  Recently, Li et al. [Phys. Rev. A, 82(2), 022303] presented two semi-quantum
secret sharing (SQSS) protocols using GHZ-like states. The proposed schemes are
rather practical because only the secret dealer requires to equip with advanced
quantum devices such as quantum memory, whereas the other agents can merely
perform classical operations to complete the secret sharing. However, this
study points out that a security pitfall exists in the eavesdropping check
phase of both schemes that could mount to an Intercept-resend attack and a
Trojan horse attack on the two schemes, respectively, to disclose the other
agent's shadow, and further to reveal the master key of the SQSS, which
contradicts to the security requirement of a QSS. Fortunately, two possible
solutions are proposed to avoid this security pitfall.
