Live Exposure Defense: From CVE to Confirmed Exposure in 12 Hours – See more

Back
New CVE Detected

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

Be the first to know when new zero-days emerge:

Subscribe to Email Alerts
Subscribe to RSS Feed

Summary

CVE-2026-90481 is a critical authentication bypass vulnerability affecting PortSwigger Burp Suite DAST (formerly Burp Suite Enterprise Edition). The flaw allows an attacker to bypass authentication controls via an alternate path or channel, potentially granting unauthorized access to the application. The issue carries a CVSS base score of 9.2 (Critical) and affects all versions from 2021.11 up to (but not including) 2026.8.

Technical details

  • Root cause: The vulnerability is classified as CWE-288 (Authentication Bypass Using an Alternate Path or Channel), meaning the application exposes a secondary access path that does not enforce the same authentication checks as the primary route.
  • Trigger conditions: An attacker can reach the alternate path or channel without needing prior authentication or user interaction.
  • Attack vector: Network-based (AV:N); the CVSS v4.0 vector indicates low attack complexity (AC:L), requires the attacker to satisfy certain attack requirements (AT:P), no privileges required (PR:N), and no user interaction (UI:N).
  • Impact: Successful exploitation results in high impact to confidentiality, integrity, and availability of the vulnerable Burp Suite DAST instance (VC:H/VI:H/VA:H), meaning an unauthenticated attacker could gain unauthorized access and potentially manipulate or disrupt the scanning platform and its data.

Affected software

  • PortSwigger Burp Suite DAST (formerly Burp Suite Enterprise Edition), versions 2021.11 through all versions prior to 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 critical security issue.
  • If immediate patching is not possible: Restrict network access to the Burp Suite DAST management interface and any exposed endpoints to trusted networks only (e.g., via firewall rules or VPN), and closely monitor authentication logs for unusual or unauthenticated access attempts until the upgrade can be applied.

References

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report

How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report
Close

Subscribe to Threat Center RSS

Copy/paste the link below into your preferred RSS reader or follow these instructions to subscribe to Slack alerts.

Open RSS feedSlack setup instructions

Close

Get Real-Time CVE Alerts to Your Email

Be the first to know when new zero-days emerge