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CVE-2023-21720: Microsoft Edge (Chromium-based) Tampering Vulnerability

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-14 · updated 2026-08-19
• Weakness: CWE-126

Description

Microsoft Edge (Chromium-based) Tampering Vulnerability

Affected products

• Microsoft Edge (Chromium): before 109.0.15.18.78 — fixed in 109.0.15.18.78
• Microsoft Edge (Chromium): from 1.0.0 before 109.0.15.18.78 — fixed in 109.0.15.18.78

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 109.0.15.18.78; Microsoft Edge (Chromium) 109.0.15.18.78. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21720
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21720
• https://security.gentoo.org/glsa/202309-17

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