Advisory Details

June 4th, 2026

(Pwn2Own) Microsoft Edge Feedback Log File Handling Directory Traversal Remote Code Execution Vulnerability

ZDI-26-331
ZDI-CAN-31431

CVE ID CVE-2026-45495
CVSS SCORE 7.5, AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Edge
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code 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 handling of feedback log files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this in conjunction with other vulnerabilities to execute 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-2026-45495
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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