Want to examine how billionaires and hedge funds trade in London Stock Exchange?

Yanir Tsarimi (Guest)
7 Jun
3 min read

Want to examine the trade of billionaires of hedge funds in London Stock Exchange? Discover how CloudDefense.AI uncovered a critical vulnerability that could allow you to do so.


The London Stock Exchange (LSE) is a cornerstone of the global financial market, facilitating daily billions of dollars/pounds sterlings in transactions. However, no system is impervious to security vulnerabilities, and recently, a critical flaw was discovered that could have compromised user accounts and led to unauthorized access. In this article, we will delve into the details of the issue, how CloudDefense identified and reported it, and the subsequent steps taken to secure the LSE's infrastructure.

Understanding the London Stock Exchange:

The London Stock Exchange is one of the oldest and largest stock exchanges in the world. It provides a platform for buying and selling various financial instruments, including stocks, bonds, and derivatives. The LSE operates in a highly regulated environment, adhering to stringent security protocols to ensure the integrity and confidentiality of user data.

The Security Issue:

The security issue uncovered in the London Stock Exchange, was a critical vulnerability that could allow an attacker to reset any user's password, granting them unauthorized access to the compromised account. This posed a significant threat to the security and confidentiality of user data, particularly for individuals and institutions with large financial holdings and investments.

The potential impact of this vulnerability cannot be overstated. Large financial institutions, investors, traders, and other market participants rely on the London Stock Exchange for conducting critical financial transactions. Unauthorized access to their accounts could result in severe economic losses, manipulation of investments, and even reputational damage.

Institutional investors, including banks, asset management firms, and pension funds, could have faced catastrophic consequences if their accounts were compromised. Such an attack could have allowed malicious actors to manipulate investment strategies, siphon funds, or disrupt financial operations, leading to substantial financial losses and potential regulatory repercussions.

Fortunately, the collaboration between and the London Stock Exchange enabled swift detection and resolution of the vulnerability before any malicious exploitation occurred. By promptly patching the security flaw and implementing additional security measures, the potential impact of the issue was mitigated, safeguarding user accounts and the integrity of the financial market ecosystem.

Here are the steps an hacker could have resetted the password for any hedge fund, billionaires or investment banks just by using social engineering. By using social engineering techniques or using services like, they could have got the email address for any billionaire.

Steps To Reproduce:

Let's see how an attacker can use this security issue to log in to any user’s account.

  1. The attacker logs in to the account that he/she controls.
  2. Then attacker changes the password of their own account and intercepts this request with a proxy tool(Burp Suite).

  1. Make sure to remove a parameter called ‘originalPassword’ and its value.

  1. Now attacker changes the username field with the victim’s username and sends the request.
  2. The attacker can log in to the victim’s account with the newly set up password.

Collaboration and Resolution:

The London Stock Exchange acknowledged the severity of the vulnerability and swiftly initiated a comprehensive investigation. The cooperation between the LSE and was exemplary, with both parties working together to address the issue promptly and effectively.

The LSE's security team worked tirelessly to develop a patch that would fix the vulnerability and prevent further exploitation. provided valuable insights and guidance throughout the process, ensuring that the solution implemented would fortify the LSE's infrastructure and mitigate future security risks.

Following extensive testing, the London Stock Exchange deployed the patch across its systems, closing the vulnerability that allowed unauthorized password resets. 


The security issue discovered in the London Stock Exchange was a wake-up call for the organization, emphasizing the need for robust security measures and ongoing vulnerability assessments. Thanks to the diligent efforts of, the vulnerability was swiftly addressed, bolstering the LSE's security infrastructure and preserving the integrity of user accounts.

In an era of increasing cyber threats, collaboration and cooperation between cybersecurity experts and organizations are essential for maintaining a safe digital environment. The incident at the London Stock Exchange serves as a reminder of the constant vigilance required to ensure the security of critical systems in the face of evolving threats.

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Yanir Tsarimi (Guest)
A longtime open source contributor, with extensive experience in DevOps principles and practices. Barbara is especially interested in helping IT businesses and organizations implement DevOps, cloud-native technologies, and open source.