CVE-2026-55945: Microsoft Edge (Chromium-based) Information Disclosure Vulnerability

Severity: medium (CVSS 4.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-28
Weakness: CWE-362

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Edge (Chromium-based) allows an authorized attacker to disclose information locally.

Affected products

Microsoft Edge (Chromium): before 150.0.4078.48 — fixed in 150.0.4078.48
Microsoft Edge (Chromium): from 1.0.0.0 before 150.0.4078.48 — fixed in 150.0.4078.48

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 150.0.4078.48; Microsoft Edge (Chromium) 150.0.4078.48. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55945

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