Cyber Resilience

CVE-2026-6300

High

Published: 15 April 2026

Published
15 April 2026
Modified
26 May 2026
KEV Added
—
Patch
—
CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0034 25.9th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-6300 is a high-severity Use After Free (CWE-416) vulnerability in Google Chrome. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Drive-by Compromise (T1189); ranked at the 25.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-6300 is a use-after-free vulnerability (CWE-416) in the CSS component of Google Chrome prior to version 147.0.7727.101. Published on 2026-04-15, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) and is rated High severity by Chromium security.

A remote attacker can exploit this issue via a crafted HTML page, leading to arbitrary code execution inside the browser's sandbox. The attack vector is network-accessible with low complexity and no required privileges, but it depends on user interaction, such as loading the malicious page.

Google addressed the vulnerability in Chrome 147.0.7727.101. Security practitioners should refer to the Chrome Releases stable channel update for desktop at https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop_15.html and Chromium issue 491994185 at https://issues.chromium.org/issues/491994185 for patch details and verification.

EU & UK References

Vulnerability details

Use after free in CSS in Google Chrome prior to 147.0.7727.101 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

CWE(s)
CWE-416

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1189 Drive-by Compromise Initial Access
Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Why these techniques?

The use-after-free in Chrome's CSS component enables arbitrary code execution via a crafted HTML page, directly mapping to Exploitation for Client Execution (T1203) and Drive-by Compromise (T1189) as the primary techniques for delivering and exploiting browser vulnerabilities.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-7357Same product: Apple Macos
CVE-2026-7342Same product: Apple Macos
CVE-2026-4680Same product: Apple Macos
CVE-2026-7355Same product: Apple Macos
CVE-2026-5284Same product: Apple Macos
CVE-2026-9992Same product: Apple Macos
CVE-2026-9118Same product: Apple Macos
CVE-2026-7336Same product: Apple Macos
CVE-2026-7974Same product: Apple Macos
CVE-2026-7352Same product: Apple Macos

Affected Assets

google
chrome
≤ 147.0.7727.101

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly mitigates the use-after-free vulnerability by requiring timely patching of Google Chrome to version 147.0.7727.101 or later.

SI-16 Memory Protection good match
prevent

Implements memory protections such as ASLR and DEP that hinder exploitation of use-after-free vulnerabilities in the CSS component.

SC-39 Process Isolation partial match
prevent

Enforces process isolation via Chrome's sandbox to limit the scope of arbitrary code execution from the CSS use-after-free to the renderer process.

References