CVE-2026-66323 Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
An attacker can execute arbitrary code remotely by exploiting improper neutralization of parameter delimiters in Microsoft Edge.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-66323?
CVE-2026-66323 is a medium-severity code injection vulnerability in Microsoft Edge Chromium, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper neutralization of parameter/argument delimiters in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
Weakness: CWE-141
Which versions are affected by CVE-2026-66323?
It affects 1 product.
Products include Microsoft Edge Chromium.
How do I fix CVE-2026-66323?
No fix has been published for CVE-2026-66323 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-66323 being exploited?
There is no known exploitation of CVE-2026-66323 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-jhf2-3wcg-p36j.