CVE-2023-4762 is a type confusion vulnerability in Google Chromium V8. CISA added it to the Known Exploited Vulnerabilities catalogue on 6 February 2024, which means attackers have used it in real attacks. Google Chromium V8 contains a type confusion vulnerability that allows a remote attacker to execute code via a crafted HTML page.
What this vulnerability means in Chromium V8
CVE-2023-4762 is a type confusion flaw in Chromium’s V8 JavaScript engine, which matters because browser engines process attacker-controlled content at massive scale. When an attacker can trigger incorrect type handling in a JIT and runtime environment, a simple web page can become a code execution path rather than just a rendering problem.
Type confusion bugs are especially dangerous in browser engines because they can undermine memory safety and let malformed script or page content influence execution flow. In practice, that turns an ordinary user visit into a potential compromise path, especially when the browser is handling untrusted HTML, JavaScript, or embedded content.
Why this kind of bug is high impact
Browser engine vulnerabilities sit at a trust boundary: they mediate between the internet and the local device. A remote attacker does not need local access if they can get a victim to load crafted content, which is why browser CVEs are frequently exploited quickly after disclosure.
This page should be read alongside the official CVE Program record and the NIST National Vulnerability Database entry for canonical record data, while vendor guidance should be used for exact remediation details. For exposed environments, the broader lesson is that browser engine bugs are not just application issues, they are endpoint compromise issues.
Because V8 is deeply integrated into Chromium, exploitation can affect browsing sessions, local data, and whatever the browser can reach through the user context. That is why remote code execution in a browser engine is treated as a material enterprise risk even when the vulnerability is reached through a single webpage.
Exposure checks and remediation priorities
Organizations should treat exposure as an asset, browser-channel, and update-management question, not just a CVE lookup. Determine which endpoints run affected Chromium-based browsers, whether they are internet-facing through normal browsing activity, and whether patch deployment is blocked by change windows, legacy application testing, or managed-device constraints.
Prioritize systems that routinely visit untrusted sites, handle privileged browsing workflows, or are used by administrators and developers. Where patching is delayed, reduce exposure by tightening web filtering, limiting access to unknown content sources, and applying compensating controls that reduce the chance of successful exploitation.
The Vulnerability Management Guide is useful here because it frames the practical workflow, asset scope, prioritisation, exceptions, and verification needed to turn a browser CVE into an actual remediation decision. For this class of issue, the authoritative version and fix status should still come from the vendor advisory and the CISA KEV catalogue.
Detection, verification, and post-exploitation review
Once a browser engine flaw has been exploited, detection often depends on indirect signals rather than a clean exploit signature. That can include unusual browser crashes, suspicious child processes, unexpected downloads, or post-visit anomalies on the affected host.
After patching, security teams should review whether the endpoint was compromised before the fix was applied. For browser exploitation, that means checking for persistence, new autoruns, unknown extensions, suspicious files, and any follow-on activity that suggests the browser was only the initial entry point.
If the affected user handled sensitive resources, review session state, saved credentials, and any tokens or accounts that may have been accessible through the browser context. A browser exploit can be a stepping stone to broader account compromise even when the vulnerability itself is only the initial code execution primitive.
Risk and Threat Considerations
A browser engine type confusion issue is dangerous because it converts ordinary web traffic into a remote code execution opportunity. When exploitation is real, the main risk is not just a crash, but a foothold on the endpoint that can be used for theft, persistence, or further intrusion.
Failure mechanism: The attacker supplies crafted HTML or script that drives the engine into inconsistent type handling, allowing memory corruption or controlled execution in the browser process.
Impact: Successful exploitation can expose the user session, local data, browser-stored secrets, and downstream access to internal services reached through the compromised workstation.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Browser-engine CVEs require timely identification, prioritization, and remediation of exposed assets. |
| CIS-4 — Secure Configuration of Enterprise Assets and Software | Browser hardening and restricted exposure reduce exploitation opportunities for crafted web content. | |
| Recommendation — Prioritise and remediate vulnerable Chromium endpoints through continuous vulnerability management. Harden browser configurations and reduce exposure to untrusted content sources. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | A confirmed Chromium V8 flaw maps directly to defect tracking, patching, and remediation. |
| RA-5 — Vulnerability Monitoring and Scanning | Exposure assessment depends on identifying affected browser installations and update status. | |
| SI-4 — System Monitoring | Exploitation detection relies on host and browser activity monitoring after suspected abuse. | |
| Recommendation — Track, test, and deploy remediation for affected browser software under flaw remediation. Scan and inventory browser assets so affected Chromium instances are identified quickly. Monitor endpoints for exploit indicators and suspicious post-compromise browser activity. | ||
Practitioner Guidance
Why practitioners should care: Treat this as a patch-priority browser issue, not a low-value desktop update. If Chromium is part of your standard workstation stack, exploitation can reach many users quickly because the attack path is remote and requires only page loading.
What to watch for: Focus on the intersection of vulnerable browser versions, active internet exposure, and privileged users. If patching is delayed, assume the exposure window is meaningful and review whether the affected endpoints can be isolated from higher-risk browsing activity.
Practitioner takeaway: For browser-engine CVEs that appear in KEV, remediation speed and post-patch compromise review matter as much as the patch itself.
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org