External risk intelligence

PortSwigger Burp Suite DAST Authentication Bypass

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-90481

Burp Suite DAST (formerly Enterprise Edition) is typically deployed as a centralized internal scanning tool within an organization's network. While it may be exposed to internal networks or potentially reach external targets, it is not a standard internet-facing public service by design, making internet reachability possible but not the common default deployment pattern.

Authentication Bypass

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

An authentication bypass vulnerability has been identified in PortSwigger Burp Suite DAST. This issue could allow unauthorized access to systems, depending on how the affected product is deployed and utilized within your environment. The primary concern is to confirm if this specific technology is in use and whether it is exposed in a manner that could be exploited.

  • Unauthorized access possible through bypass.
  • Confirm if your organization uses this tool.
  • Assess relevance and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could bypass authentication by exploiting an alternate path or channel within the application. This could allow them to gain unauthorized access to the system and potentially execute actions as a different user. The exact method for reaching this vulnerable component is not detailed, but it involves a non-standard way of interacting with the application.

  • No initial access required.
  • Triggered via alternate path or channel.
  • Risk of unauthorized access.

Live Threat

Current exploitation, exposure, and threat context

In PortSwigger Burp Suite DAST, an authentication bypass could occur via an alternate path or channel, potentially affecting service behavior when supported by the advisory.

  • Service behavior may be altered.
  • Bypass could occur via alternate paths.
  • Service may be accessed without authentication.

Operational Fix

Recommended remediation, mitigation, and detection steps

Security teams and application owners should collaborate to address this authentication bypass vulnerability in Burp Suite DAST. The first practical step is to identify all instances of the affected technology within your environment, assess their reachability and business criticality, and then locate the accountable owner. Planning remediation efforts should be based on the assessed risk.

  • Identify responsible teams and owners.
  • Verify current deployments and exposure.
  • Plan remediation based on risk.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is PortSwigger Burp Suite DAST?

Burp Suite DAST, formerly known as Burp Suite Enterprise Edition, is a specialized software tool used by security professionals and developers to automate web application security testing. It functions as a centralized platform that scans websites and APIs to identify potential security flaws and vulnerabilities during the development lifecycle.

What does CWE-288 mean for CVE-2026-90481?

CVE-2026-90481 involves an authentication bypass, classified as CWE-288: Authentication Bypass Using an Alternate Path or Channel. This means the software contains a secondary way to access features or data that accidentally skips the normal security check, allowing an unauthorized user to interact with the system as if they had already successfully logged in.

How is this authentication bypass triggered?

The vulnerability is triggered when an attacker interacts with the application through a non-standard path or unconventional channel that the software does not properly protect. Standard interactions through the primary login interface are not necessarily the focus; rather, the issue lies in hidden or secondary logic that assumes a level of trust that should not exist.

Do I need to worry if my instance is internal?

According to Halo Surface Signal, Burp Suite DAST is typically deployed as a centralized internal scanning tool. While it is not designed to be a public internet-facing service, its reachability depends on your specific network configuration. If the interface is accessible beyond the intended administrative segment, it may be vulnerable to unauthorized access attempts.

What is the first step to address this CVE?

Begin by auditing your environment to locate every instance of Burp Suite DAST currently in use. Once you have identified these installations, determine which teams own them and evaluate how they are connected to your network. This visibility allows you to prioritize systems based on their accessibility and business importance for remediation planning.

References