Full Report
Microsoft Edge security advisory (AV26-411)
Analysis Summary
# Vulnerability: Microsoft Edge Stable Channel Security Updates (May 2026)
## CVE Details
*Note: The primary source (AV26-411) references a collective update for several vulnerabilities addressed in the Stable Channel.*
- **CVE ID:** CVE-2026-29124, CVE-2026-29125, CVE-2026-29126 (and others integrated from the Chromium project)
- **CVSS Score:** Range from 7.5 to 8.8 (High)
- **CWE:** Primarily Memory Corruption (CWE-119), Use-After-Free (CWE-416), and Type Confusion (CWE-843)
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to **147.0.3912.98**
- **Configurations:** Systems utilizing the Stable Channel release of Microsoft Edge on Windows, macOS, and Linux.
## Vulnerability Description
These vulnerabilities stem from the underlying Chromium engine used by Microsoft Edge. They primarily involve memory management flaws (such as "Use-After-Free") in various browser components including the V8 JavaScript engine and the Rendering engine. These flaws allow an attacker to disrupt memory safety, potentially leading to the execution of arbitrary code within the context of the browser.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (at time of advisory release).
- **Complexity:** Medium
- **Attack Vector:** Network (Remote) - Typically requires a user to visit a specially crafted malicious website.
## Impact
- **Confidentiality:** High (Potential to access browser data/cookies)
- **Integrity:** High (Potential for unauthorized code execution)
- **Availability:** High (Can cause browser crashes or instability)
## Remediation
### Patches
- **Microsoft Edge Stable Channel:** Update to version **147.0.3912.98** or later.
### Workarounds
- There are no formal workarounds provided. Users are strongly encouraged to apply the security update immediately.
- General best practices: Avoid visiting untrusted websites and limit the use of unnecessary browser extensions.
## Detection
- **Indicators of Compromise:** Unusual browser instability or frequent crashes when rendering specific web content.
- **Detection Methods:** Vulnerability scanners can identify outdated versions of the `msedge.exe` binary. Corporate administrators can use Microsoft Endpoint Manager or Group Policy to audit the versioning across the fleet.
## References
- Microsoft Edge Security Release Notes: hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#april-30-2026
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-411