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STIG-Edge-RCE-CVE2025-9478 — Remediation of Microsoft Edge (Chromium) Remote Code Execution vulnerability (CVE-2025-9478, Plugin ID: 258091). Documentation includes before/after evidence, remediation steps, and Tenable validation. | Kitploit
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GitHubkamgreen50/stig-edge-rce-cve2025-9478

STIG-Edge-RCE-CVE2025-9478

Remediation of Microsoft Edge (Chromium) Remote Code Execution vulnerability (CVE-2025-9478, Plugin ID: 258091). Documentation includes before/after evidence, remediation steps, and Tenable validation.

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11 months agoNot yet reviewed

STIG – Microsoft Edge (Chromium) < 139.0.3405.125 Remote Code Execution (CVE-2025-9478, Plugin ID: 258091)

Before

  • Finding: Microsoft Edge (version 139.0.3405.86) was outdated and vulnerable to a critical Remote Code Execution (RCE) flaw (CVE-2025-9478).
  • Risk: Attackers could exploit a use-after-free in ANGLE to execute arbitrary code through crafted HTML pages.
  • Evidence:
    Before – Tenable Finding
    Before – Version Details

Remediation

  1. Updated Microsoft Edge to version 139.0.3405.125 (patched).
  2. Verified the version update (edge://settings/help).
  3. Restarted Edge to finalize the patch.
  4. Performed a Tenable rescan to confirm the vulnerability was resolved.

After

Microsoft Edge successfully updated to version 139.0.3405.125, mitigating CVE-2025-9478 and preventing potential remote code execution.

Evidence:
Edge-After-Details.png
Edge-After-Tenable-Rescan.png

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