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CVE-2025-21399: Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-01-17 · updated 2026-06-17
• Weakness: CWE-426

Description

Microsoft Edge (Chromium-based) Update Elevation of Privilege Vulnerability

Affected products

• Microsoft Edge Update Setup: before 1.3.195.43 — fixed in 1.3.195.43
• Microsoft Edge Update Setup: from 1.0.0.0 before 1.3.195.43 — fixed in 1.3.195.43

How to fix

Upgrade to a fixed version: Microsoft Edge Update Setup 1.3.195.43; Microsoft Edge Update Setup 1.3.195.43. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21399
• https://www.vicarius.io/vsociety/posts/elevation-of-privilege-vulnerability-in-microsoft-edge-chromium-based-detection-script
• https://www.vicarius.io/vsociety/posts/elevation-of-privilege-vulnerability-in-microsoft-edge-chromium-based-mitigation-script

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