In this post, we will be discussing a newly identified security vulnerability, CVE-2022-30127, which affects the Chromium-based Microsoft Edge browser. CVE-2022-30127 is unique from a different vulnerability with a similar CVE ID, CVE-2022-30128. In this post, we will dive into the technical details of this vulnerability, its potential impact, and the ways to mitigate it.

Details of CVE-2022-30127

CVE-2022-30127 refers to a security vulnerability in the Chromium-based Microsoft Edge browser, where an attacker might be able to elevate their privilege levels and execute arbitrary code on the targeted system. This elevation of privilege vulnerability allows an attacker to gain access to system resources and data that they would typically not have access to, thereby potentially compromising the security and integrity of the affected system.

Original References

The CVE-2022-30127 vulnerability was first reported to Microsoft by external security researchers. Microsoft has acknowledged the vulnerability and addressed it in their recent security updates. Here are the links to the original resources that provide more in-depth information about this vulnerability:

- Microsoft Security Update Guide
- CVE Details

Code Snippet - Vulnerable Function

To better understand the impact of this vulnerability, we will be looking at a simplified code snippet that illustrates the error that caused the vulnerability in the first place:

function vulnerableFunction(arg) {
  // Incorrectly checking the user's privileges
  if (currentUser.isPrivileged == false) {
    // This block should not be accessible to non-privileged users

In the code snippet above, the problematic part is the incorrect check for the user's privileges. The code checks if the user is _not_ privileged and then _erroneously_ executes a sensitive action meant for privileged users.

Exploit Details

An attacker with knowledge of this vulnerability may use it to elevate their privileges in the target system. Once the attacker has elevated privileges, they would potentially have increased access to sensitive information and an enhanced ability to manipulate the system.

The attacker could potentially perform the following exploit steps to take advantage of this vulnerability:

Craft a malicious payload that triggers the vulnerability.

3. Deliver the payload to the target user, potentially using social engineering tactics, such as phishing.

User interacts with the malicious payload, triggering the exploit.

5. Attacker gains elevated privileges on the target system, potentially compromising data and system integrity.

To protect your systems against CVE-2022-30127, you should take the following steps

1. Update Microsoft Edge: Update your Chromium-based Microsoft Edge browser to the latest version available, which includes patches to address this vulnerability. The specific patched version depends on the device and operating system, so consult the Microsoft Security Update Guide for more information.
2. Maintain Good Security Practices: Follow best practices in system security, such as keeping all software up-to-date, using strong and unique passwords, enabling multi-factor authentication, and being cautious of phishing attacks.
3. Apply the Principle of Least Privilege: Limit user accounts to the minimum required permissions, reducing the potential impact of a compromised account.
4. Perform Regular Security Audits: Regularly monitor and audit your systems, networks, and logs for any unusual or suspicious activities that might be indicative of a security compromise.


The CVE-2022-30127 vulnerability in the Chromium-based Microsoft Edge browser represents a potential risk to users and requires prompt action to mitigate it. By following the recommended mitigation steps and adhering to best security practices, you can protect your systems and minimize the impact of this vulnerability.


Published on: 06/01/2022 20:15:00 UTC
Last modified on: 08/15/2022 11:21:00 UTC