Full Report
Microsoft Edge security advisory (AV26-177)
Analysis Summary
# Vulnerability: Microsoft Edge Stable Channel Security Updates (February 2026)
## CVE Details
- **CVE ID:** Multiple (Refer to vendor release notes for full list; typically includes Chromium project components)
- **CVSS Score:** Various (Often ranging from High to Critical for browser-based RCE)
- **CWE:** Varies (Commonly includes Use-After-Free, Type Confusion, and Out-of-bounds memory access)
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to **145.0.3800.82**
- **Configurations:** Systems utilizing the Stable Channel of Microsoft Edge on Windows, macOS, and Linux.
## Vulnerability Description
This advisory covers several security flaws addressed by the update to version 145.0.3800.82. As Microsoft Edge is built on the Chromium open-source project, these vulnerabilities typically involve memory safety issues within the V8 JavaScript engine, rendering components, or specific Edge-proprietary features. The flaws could allow an attacker to bypass security boundaries or execute arbitrary code within the context of the browser.
## Exploitation
- **Status:** Consult official Microsoft advisory for specific "Exploited in the wild" flags (Public PoCs often emerge shortly after Chromium-based updates).
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote) - Typically requires a user to visit a specially crafted malicious website.
## Impact
- **Confidentiality:** High (Potential to access sensitive browser data or cookies)
- **Integrity:** High (Potential for unauthorized modification of data)
- **Availability:** High (Potential for browser instability or service disruption)
## Remediation
### Patches
- **Update to Microsoft Edge version 145.0.3800.82 or later.**
- Updates are typically applied automatically upon browser restart.
- Manual check: `Settings` > `About Microsoft Edge`.
### Workarounds
- There are no practical workarounds that maintain full functionality; patching is the only recommended solution.
- Implement "Least Privilege" principles to limit the impact of a successful browser compromise.
## Detection
- **Indicators of compromise:** Crashes in `msedge.exe` processes or unusual outbound network traffic from the browser.
- **Detection methods and tools:**
- Use Vulnerability Scanners (e.g., Nessus, Qualys) to identify outdated browser versions.
- Monitor endpoint logs for suspicious child processes spawned by `msedge.exe`.
## References
- **Vendor Advisory:** hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#february-26-2026
- **Canadian Centre for Cyber Security:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-177