Full Report
Microsoft security advisory (AV26-747)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Microsoft Edge (Chromium-based)
## CVE Details
- **CVE ID:** CVE-2026-57978, CVE-2026-57989, CVE-2026-57990
- **CVSS Score:** Not explicitly listed in the advisory (Typically ranges from 6.5 to 8.8 for Chromium-based remote code execution flaws).
- **CWE:** Varies by CVE (Commonly Includes Type Confusion, Use-After-Free, or Out-of-bounds memory access).
## Affected Systems
- **Products:** Microsoft Edge (Chromium-based)
- **Versions:** All versions prior to **150.0.4078.99**
- **Configurations:** Systems running the browser on Windows, macOS, and Linux are generally affected.
## Vulnerability Description
These vulnerabilities represent security flaws within the Chromium engine utilized by Microsoft Edge. While specific technical deep-dives for 2026-dated CVEs are restricted to vendor documentation, these types of vulnerabilities typically involve memory corruption issues (such as Use-After-Free or Type Confusion) in the V8 JavaScript engine or the Mojo IPC framework. Successful exploitation allows an attacker to execute arbitrary code or bypass security sandboxes within the context of the browser.
## Exploitation
- **Status:** Under Investigation / Not reported as exploited in the wild (based on initial advisory release).
- **Complexity:** Low to Medium
- **Attack Vector:** Network (Remote) - Typically requires a user to visit a specially crafted malicious website.
## Impact
- **Confidentiality:** High (Potential for data theft and session hijacking)
- **Integrity:** High (Potential for unauthorized system modifications)
- **Availability:** High (Potential for browser or system crashes)
## Remediation
### Patches
Microsoft has released an update to address these vulnerabilities. Users should ensure they are running the following version or newer:
- **Microsoft Edge (Chromium-based): 150.0.4078.99**
### Workarounds
There are no official manual workarounds provided. The primary mitigation is the application of the security update.
## Detection
- **Indicators of Compromise:** Unusual browser crashes, unexpected outbound network traffic to unknown IPs, or unauthorized modifications to browser settings.
- **Detection methods and tools:**
- Monitor software inventory tools for Edge versions lower than **150.0.4078.99**.
- Utilize Endpoint Detection and Response (EDR) tools to monitor for suspicious child processes spawned by `msedge.exe`.
## References
- [Vendor Advisory: CVE-2026-57978] hxxps[://]msrc[.]microsoft[.]com/update-guide/vulnerability/CVE-2026-57978
- [Vendor Advisory: CVE-2026-57989] hxxps[://]msrc[.]microsoft[.]com/update-guide/vulnerability/CVE-2026-57989
- [Vendor Advisory: CVE-2026-57990] hxxps[://]msrc[.]microsoft[.]com/update-guide/vulnerability/CVE-2026-57990
- [Microsoft Security Update Guide] hxxps[://]msrc[.]microsoft[.]com/update-guide/vulnerability