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CVE-2026-88097: Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-10-31
• Weakness: CWE-416

Description

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to elevate privileges locally.

Affected products

• Microsoft Edge (Chromium): before 153.0.4234.46 — fixed in 153.0.4234.46
• Microsoft Edge (Chromium): from 1.0.0.0 before 153.0.4234.46 — fixed in 153.0.4234.46

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 153.0.4234.46; Microsoft Edge (Chromium) 153.0.4234.46. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88097

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