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CVE-2025-53791: Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-05 · updated 2026-06-17
• Weakness: CWE-284

Description

Improper access control in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

Affected products

• Microsoft Edge (Chromium): before 140.0.3485.54 — fixed in 140.0.3485.54
• Microsoft Edge (Chromium): from 1.0.0.0 before 140.0.3485.54 — fixed in 140.0.3485.54

How to fix

Upgrade to a fixed version: Microsoft Edge (Chromium) 140.0.3485.54; Microsoft Edge (Chromium) 140.0.3485.54. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53791

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