---
title: GPT-5's Router Vulnerability Lets Hackers Access Weaker, Less Safe Models
description: Adversa AI finds a flaw in GPT-5's routing. Read on to find out more.
canonical_url: https://codekeeper.co/ticker/gpt-5-routing-flaw-security-risk
---

[Vulnerabilities](https://codekeeper.co/ticker/tag/vulnerabilities)

# 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.

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By Content Team 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](https://www.securityweek.com/gpt-5-has-a-vulnerability-it-may-not-be-gpt-5-answering-your-call/)

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