GPT-5's Router Vulnerability Lets Hackers Access Weaker, Less Safe Models

Adversa AI finds a flaw in GPT-5's routing. Read on to find out more.

Aug 25, 2025

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Researchers at Adversa AI discovered a major flaw in GPT-5's internal routing system that creates serious security risks. When users ask GPT-5 questions, an internal router decides which model actually responds – it might be GPT-5 Pro, but could equally be older versions like GPT-3.5 or GPT-4o.

Hackers can manipulate this router using specific trigger phrases, forcing queries to weaker, less secure models that are easier to jailbreak. This "PROMISQROUTE" vulnerability means GPT-5 is only as secure as its weakest predecessor.

While the routing saves costs and improves speed, it allows old jailbreaks to work again by targeting vulnerable older models instead of GPT-5's stronger safeguards.

Source: Security Week

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