Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
Published Aug 3, 2026
9.6
CRITICALCVSS 3.1
EPSS 1.07%
Description
Access of resource using incompatible type ('type confusion') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
Affected products
-
- Version 1.0.0.0StatusaffectedConstraints<151.0.4129.59
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft Edge (Chromium-based) | n/a |
|
- < 151.0.4129.59
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Aug 4, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.07% (0.01066) | 63.57th | v5 (v2026.06.15) |
| Aug 4, 2026 | 0.94% (0.00943) | 57.60th | v5 (v2026.06.15) |
References (1)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66321 vendor-advisorypatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66321 | vendor-advisorypatchVendor Advisory |
Change history (0)
No recorded changes yet.