Review reviewHigh

CVE-2026-50521

Microsoft Microsoft Edge (Chromium-based), edge chromium

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

CVSS
8.3
EPSS
0.46%
37.3% percentile
CISA KEV
Not listed
Published
2026.07.02
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.46%
Technical severityCVSS 8.3

Vulnerability overview

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

Affected product and versions

Product
Microsoft Microsoft Edge (Chromium-based), edge chromium
Affected versions
1.0.0.0, < 149.0.4022.67
Fixed versions
149.0.4022.67

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Microsoft Edge (Chromium-based), edge chromium and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
CWE
CWE-416