CVE-2026-66312 Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
An authorized attacker can execute arbitrary code remotely via a buffer over-read in Microsoft Edge.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66312?
CVE-2026-66312 is a medium-severity memory corruption vulnerability in Microsoft Edge Chromium, published on 3 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Buffer over-read in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.
Weakness: CWE-126
Which versions are affected by CVE-2026-66312?
It affects 1 product.
Products include Microsoft Edge Chromium.
How do I fix CVE-2026-66312?
No fix has been published for CVE-2026-66312 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-66312 being exploited?
There is no known exploitation of CVE-2026-66312 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Edge Chromium
- CVE-2024-21326 Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability
- CVE-2023-35618 Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability
- CVE-2023-36735 Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability
- CVE-2022-33649 Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability
- CVE-2026-58289 Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
Sources
Also known as GHSA-jxgm-6gw2-5xw5.