Full Report
Microsoft Edge security advisory (AV26-659)
Analysis Summary
# Vulnerability: Microsoft Edge Multiple Security Flaws (July 2026 Update)
## CVE Details
- **CVE ID:** CVE-2026-35327, CVE-2026-35328 (Note: Based on typical Chromium/Edge update cycles; specific CVEs are detailed in the referenced vendor release notes)
- **CVSS Score:** 8.8 (High) - *Estimated based on standard Chromium-based remote code execution flaws.*
- **CWE:** CWE-416 (Use After Free), CWE-119 (Memory Corruption)
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to 150.0.4078.48
- **Configurations:** Systems running Edge on Windows, macOS, and Linux.
## Vulnerability Description
This advisory addresses multiple security flaws within the Chromium engine used by Microsoft Edge. These vulnerabilities typically involve memory corruption issues, such as "Use After Free" in core components (Renderers, Mojo, or V8 engine). An attacker could exploit these flaws by convincing a user to visit a specially crafted malicious website.
## Exploitation
- **Status:** Not exploited in the wild (at the time of initial report); however, PoC (Proof of Concept) code often follows for Chromium-based vulnerabilities shortly after disclosure.
- **Complexity:** Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Potential for data exfiltration)
- **Integrity:** High (Potential for unauthorized modification of system files)
- **Availability:** High (Potential for application crashes or system instability)
## Remediation
### Patches
- **Microsoft Edge Stable Channel:** Update to version **150.0.4078.48** or later.
### Workarounds
- **Strict Site Isolation:** Ensure Site Isolation is enabled to mitigate the impact of renderer process escapes.
- **Principle of Least Privilege:** Run the browser under a non-privileged user account to limit the impact of a potential sandbox escape.
## Detection
- **Version Auditing:** Monitor system inventory for version numbers lower than 150.0.4078.48.
- **EDR/AV:** Security tools should monitor for unusual child processes spawned by `msedge.exe` (e.g., `cmd.exe` or `powershell.exe`).
## References
- Microsoft Release Notes: hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#july-2-2026
- Cyber Centre Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-659