Risk ownership is the most important detail to capture in an organization's risk register. Risk ownership is the responsibility for managing a risk, including taking corrective action, and should be assigned to a specific individual or team. It is important to note that the risk owner is not necessarily the same as the risk acceptor, who is the individual or team who makes the final decision to accept a risk. Capturing risk ownership in the risk register is important to ensure that risks are actively managed and that the responsible parties are held accountable.

The BEST indication that an organization has a mature information security culture is when its staff consistently consider risk in making decisions. When an organization's staff understands the risks associated with their actions and are empowered to make risk-informed decisions, it indicates that the organization has a mature information security culture.
According to the Certified Information Security Manager (CISM) Study Manual, "A mature information security culture exists when the people within the organization understand and appreciate the risks associated with information and technology and when they take steps to manage those risks on a daily basis." While information security training, documented information security policies, and regular interaction between the chief information security officer (CISO) and the board are all important components of a mature information security culture, they are not sufficient on their own. It is only when staff consistently consider risk in making decisions that an organization's information security culture can be considered mature.
Reference:
Certified Information Security Manager (CISM) Study Manual, 15th Edition, Pages 151-152.

Escalate to senior management, because this could help the information security manager to inform the decision-makers of the situation, explain the implications and trade-offs, and seek their guidance and approval for the next steps2. However, this answer is not certain, and you might need to consider other factors as well.