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CVE-2026-21223: Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

• Severity: high (CVSS 7.1 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: 2026-01-16 · updated 2026-07-30
• Weakness: CWE-269

Description

Improper privilege management in Microsoft Edge (Chromium-based) allows an authorized attacker to bypass a security feature locally.

Affected products

• Microsoft Edge (Chromium): before 144.0.3719.82 — fixed in 144.0.3719.82
• Microsoft Edge (Chromium): from 1.0.0.0 before 144.0.3719.82 — fixed in 144.0.3719.82

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 144.0.3719.82; Microsoft Edge (Chromium) 144.0.3719.82. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21223

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