Cooperative rate-splitting multiple access (RSMA) has emerged as a promising solution for increasing spectral efficiency over conventional RSMA. On the other hand, the presence of eavesdroppers seriously compromises secure communication due to the open nature of the wireless channel. In this paper, we study the physical-layer security (PLS) of a two-user downlink cooperative RSMA network in the presence of an eavesdropper. The cooperative jamming and relaying scheme is proposed to enhance diversity and security, where the near user opportunistically generates an artificial noise (AN) and forwards its decoded common message in two transmission phases. Our goal is to maximize the worst-case secrecy rate (SR) of both users by jointly optimizing beamforming vectors and resource allocation. To address the challenges posed by the non-convexity of the optimization problem, we propose a sequential parametric convex approximation (SPCA)-based iterative algorithm, which involves approximating the non-convex objective and constraints with a sequence of convex functions. The effectiveness of the proposed scheme is verified through the simulation results.