Full Report
Microsoft Edge security advisory (AV26-640)
Analysis Summary
# Vulnerability: Microsoft Edge Stable Channel Security Updates (June 2026)
## CVE Details
*Note: The primary advisory references the cumulative security updates for the Chromium engine and Edge-specific flaws included in this release.*
- **CVE ID:** CVE-2026-30232 (Lead CVE for this release)
- **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) Browser
- **Versions:** All versions prior to 149.0.4022.98
- **Configurations:** Systems running the Stable Channel of Microsoft Edge on Windows, macOS, and Linux.
## Vulnerability Description
This advisory addresses several security flaws inherited from the Chromium open-source project and Edge-specific enhancements. The primary vulnerability involves a **Use-After-Free** flaw in the browser's Rendering engine. An attacker can exploit this by crafting a malicious webpage that, when visited by a user, triggers memory corruption within the browser process. This can lead to the execution of arbitrary code or a bypass of the browser sandbox.
## Exploitation
- **Status:** Not exploited in the wild (at time of release); PoC available for certain underlying Chromium components.
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote/Web-based)
## Impact
- **Confidentiality:** High (Potential for unauthorized data access)
- **Integrity:** High (Potential for unauthorized modification of data/system settings)
- **Availability:** High (Potential for application crashes or system instability)
## Remediation
### Patches
Microsoft has released the following update to address these vulnerabilities:
- **Microsoft Edge Stable Channel:** Version **149.0.4022.98** or later.
### Workarounds
- No official workarounds are provided. Users are strongly encouraged to apply the security update immediately.
- General mitigation: Restrict browsing to trusted sites and avoid clicking on suspicious links until the patch is applied.
## Detection
- **Indicators of Compromise:** Unusual browser crashes, unexpected outgoing network connections from the `msedge.exe` process, or unauthorized file system modifications within the user profile.
- **Detection Methods:**
- Configuration management tools (SCCM/Intune) can be used to audit installed versions of Edge.
- Security Information and Event Management (SIEM) systems should monitor for browser process anomalies.
## References
- [Microsoft Edge Stable Channel Release Notes] hxxps[://]learn[.]microsoft[.]com/en-us/DeployEdge/microsoft-edge-relnotes-security#june-26-2026
- [Cyber Centre Advisory AV26-640] hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/microsoft-edge-security-advisory-av26-640