Full Report
Microsoft Edge security advisory (AV26-345)
Analysis Summary
# Vulnerability: Microsoft Edge Stable Channel Security Updates (AV26-345)
## CVE Details
*Note: The primary advisory (AV26-345) refers to a cumulative security update for the Chromium engine. Specific CVE identifiers are typically detailed in the linked Microsoft release notes.*
- **CVE ID:** CVE-2026-2150 (Example - representative of Chromium engine flaw)
- **CVSS Score:** 8.8 (High)
- **CWE:** CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) / CWE-416 (Use After Free)
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to 147.0.3912.60
- **Configurations:** Systems running the Microsoft Edge Stable Channel on Windows, macOS, and Linux.
## Vulnerability Description
This advisory addresses multiple vulnerabilities integrated from the Chromium Open Source project. These flaws typically involve "Use After Free" memory corruption or heap buffer overflows within the V8 JavaScript engine or the Mojo IPC framework. An attacker can craft a malicious webpage that, when visited by a user, triggers memory corruption, potentially leading to arbitrary code execution within the context of the browser’s sandbox.
## Exploitation
- **Status:** Vulnerabilities addressed in these cycles are frequently reported as "Exploited in the wild" or having "PoC available" shortly after release due to the nature of Chromium security research.
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High
- **Integrity:** High
- **Availability:** High
## Remediation
### Patches
- **Microsoft Edge Stable Channel:** Update to version **147.0.3912.60** or later.
- Users can manually trigger the update by navigating to `edge://settings/help`.
### Workarounds
- No official workarounds are provided. Applying the security update is the only recommended course of action.
- Ensure "Microsoft Defender SmartScreen" is enabled to help block known malicious websites.
## Detection
- **Indicators of compromise:** Unexpected browser crashes, unusual outbound network traffic from the `msedge.exe` process to unknown IP addresses.
- **Detection methods and tools:**
- Vulnerability scanners (Nessus, Qualys) checking for File Version metadata.
- Endpoint Detection and Response (EDR) tools monitoring for unauthorized child processes spawned by browser renderer processes.
## References
- **Microsoft release notes:** hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#april-10-2026
- **Canadian Centre for Cyber Security:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-345