Full Report
Microsoft Edge security advisory (AV26-243)
Analysis Summary
# Vulnerability: Critical Security Update for Microsoft Edge (March 2026)
## CVE Details
- **CVE ID:** CVE-2026-3910
- **CVSS Score:** Not explicitly listed in advisory (Typically High/Critical for Edge remote code execution)
- **CWE:** Not specified
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to **146.0.3856.59**
- **Configurations:** Systems running the Stable Channel of Microsoft Edge.
## Vulnerability Description
While the specific technical technical mechanism (e.g., Use-After-Free, Type Confusion) is not detailed in the brief advisory, this vulnerability exists within the Chromium engine utilized by Microsoft Edge. It pertains to a flaw that allows for the compromise of the browser session, typically through the processing of specifically crafted web content.
## Exploitation
- **Status:** **Exploited in the wild** (Microsoft has indicated an exploit is available/active).
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High
- **Integrity:** High
- **Availability:** High
- *Note: Successful exploitation generally allows for arbitrary code execution within the context of the browser sandbox.*
## Remediation
### Patches
Microsoft has released the following update to address these flaws:
- **Microsoft Edge Stable Channel:** Update to version **146.0.3856.59** or later.
### Workarounds
- There are no primary workarounds that replace the need for patching.
- General hygiene: Avoid clicking suspicious links or visiting untrusted websites until the update is applied.
## Detection
- **Indicators of compromise:** Monitor for unusual browser crashes or unauthorized outbound network connections from the `msedge.exe` process.
- **Detection methods and tools:**
- Verify the version of Edge by navigating to `edge://settings/help`.
- Use Vulnerability Management scanners to identify hosts running versions earlier than 146.0.3856.59.
## References
- Microsoft Edge Stable Channel Release Notes: hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#march-13-2026
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-243