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CVE-2026-90481 – Authentication Bypass – PortSwigger Burp Suite DAST 2021.11 through before 2026.8

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Summary

CVE-2026-90481 is an authentication bypass vulnerability affecting PortSwigger Burp Suite DAST (formerly Burp Suite Enterprise Edition). The flaw allows an unauthenticated attacker to bypass authentication controls via an alternate path or channel, and has been assigned a CVSS score of 9.2 (Critical). PortSwigger has released a fixed version and describes the update as containing a critical security fix.

Technical details

  • Root cause: classified as CWE-288 (Authentication Bypass Using an Alternate Path or Channel), indicating that the affected product exposes a route to protected functionality that does not enforce the same authentication checks as the primary path.
  • Trigger conditions: no authentication or user interaction is required to exploit the flaw (per the published CVSS vector: PR:N, UI:N).
  • Attack vector: network-based, meaning the vulnerability can be exploited remotely over the network without local access to the host.
  • Impact: successful exploitation can lead to high-impact loss of confidentiality, integrity, and availability of the affected application and its data.

Affected software

  • PortSwigger Burp Suite DAST (formerly Burp Suite Enterprise Edition), versions 2021.11 up to (but not including) 2026.8.

Severity

  • CVSS v4.0 Base Score: 9.2 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Mitigation and recommended actions

  • Immediate: Upgrade Burp Suite DAST to version 2026.8 or later, which contains the fix for this vulnerability.
  • If no patch: No workaround has been published by the vendor; restrict network access to the Burp Suite DAST management/administrative interfaces to trusted networks only until the upgrade can be applied.

References

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