(Pwn2Own) Microsoft Edge Origin Validation Error Security Bypass Vulnerability

June 4th, 2026
ZDI-26-329 ZDI-CAN-31429

CVE ID

CVE-2026-45492

CVSS Score

4.3 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected Vendors

Microsoft

Affected Products

Edge

Vulnerability Details

This vulnerability allows remote attackers to access restricted functionality on affected installations of Microsoft Edge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the cross-device managed sign-in mechanism. The issue results from insufficient validation of the origin of web content. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current user.

Additional Details

Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45492

Disclosure Timeline

  • 2026-05-20 - Vulnerability reported to vendor
  • 2026-06-04 - Coordinated public release of advisory
  • 2026-06-04 - Advisory Updated

Credit

Orange Tsai (@orange_8361) of DEVCORE Research Team (@d3vc0r3)

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