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CVE-2021-34506: Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-30 · updated 2026-06-17

Description

Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

Affected products

• Microsoft Edge (Chromium): before 91.0.864.59 — fixed in 91.0.864.59
• Microsoft Edge (Chromium): from 1.0.0 before 91.0.864.59 — fixed in 91.0.864.59

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 91.0.864.59; Microsoft Edge (Chromium) 91.0.864.59. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34506
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34506

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