CVE-2026-66798
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-66798- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C - Weakness
- CWE-416
- Updated
- 2026-11-02
EUVDEUVD-2026-67851
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-67851- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c27v-65fh-7pg2
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code...
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
- Record
GHSA-c27v-65fh-7pg2- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
NVD
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-66798- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-66798 is a medium vulnerability (CVSS 4.3) in Microsoft Edge (chromium-based), published August 28, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.79%, the 56th percentile. No source names a fixed version.