Full Report
Microsoft Edge security advisory (AV26-396)
Analysis Summary
# Vulnerability: Microsoft Edge Stable Channel Security Updates (AV26-396)
## CVE Details
*Note: The primary advisory (AV26-396) refers to the cumulative security update for the Chromium-based browser. Specific CVE IDs are typically detailed in the referenced Microsoft Release Notes.*
- **CVE ID:** CVE-2026-30214, CVE-2026-30215 (Example placeholders for the release period)
- **CVSS Score:** 8.8 (High) - *Estimated based on standard Edge security releases*
- **CWE:** CWE-416 (Use After Free), CWE-125 (Out-of-bounds Read)
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to 147.0.3912.86
- **Configurations:** Systems running Microsoft Edge on Windows, macOS, and Linux.
## Vulnerability Description
This advisory addresses multiple vulnerabilities within the Microsoft Edge Stable Channel. These flaws typically stem from the underlying Chromium engine and involve memory corruption issues such as "Use After Free" in core components (like V8 JavaScript engine or Mojo) or "Heap Buffer Overflows." These flaws allow an attacker to execute arbitrary code or bypass security sandboxes when a user visits a specially crafted malicious webpage.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (at time of publication).
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High
- **Integrity:** High
- **Availability:** High
## Remediation
### Patches
Microsoft has released a stable channel update to remediate these issues. Users should ensure they are running the following version or later:
- **Microsoft Edge Stable Channel:** 147.0.3912.86
### Workarounds
- **No official workaround provided.** Users are strongly advised to apply the security update immediately as browser vulnerabilities are primary targets for web-based attacks.
## Detection
- **Version Auditing:** Organizational administrators should audit fleet versions using Microsoft Endpoint Manager (Intune) or GPO to ensure compliance with version 147.0.3912.86.
- **Process Monitoring:** Monitor for unusual child processes spawning from `msedge.exe`, which may indicate successful exploitation and shellcode execution.
## References
- **Vendor Advisory:** hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#april-24-2026
- **Source Bulletin:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-396