High

Use-after-free in FedCM in Google Chrome

IdentifiersCVE-2026-4680CWE-416· Use After Free

CVE-2026-4680 is a high-severity use-after-free vulnerability in the FedCM (Federated Credential Management) component of Google Chrome. It affects Google Chrome versions prior to 146.0.7680.165. The flaw can be triggered by a remote attacker via a crafted HTML page, causing Chrome to access memory after it has been freed. According to the provided content, successful exploitation allows arbitrary code execution inside the browser sandbox. Chromium assigned the issue a High severity rating.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a remote attacker to execute arbitrary code within the Chrome sandbox in the context of the affected renderer or browser component handling the malicious content. The provided CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates high potential impact to confidentiality, integrity, and availability, although the supplied description specifically states code execution is achieved inside the sandbox rather than full host compromise.

Mitigation

If you can’t patch tonight, do this now.

Until patching is completed, reduce exposure by limiting access to untrusted or attacker-controlled websites and HTML content, and ensure browsers are restarted after updates are installed because protections do not take effect until relaunch. In enterprise environments, expedite deployment through centralized patch management. No specific workaround beyond updating was provided in the content.

Remediation

Patch, then assume compromise.

Update Google Chrome to version 146.0.7680.165 or later. The provided content states the issue affects versions prior to 146.0.7680.165 and that Google released fixes in Chrome 146.0.7680.164/165 for Windows and Mac and 146.0.7680.164 for Linux as part of the relevant security rollout. Apply the latest vendor-provided stable release and restart the browser so the fix takes effect.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

GoogleChromeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

15 SOURCESView more in app

techrepublic com securityNews

Mar 27, 2026

Google Issues High-Risk Security Patch for 3.5 Billion Chrome Users

A high-severity use-after-free vulnerability in Chrome's FedCM component.

cyber security newsNews

Mar 24, 2026

Chrome Security Update Fixes 8 Vulnerabilities Allowing Remote Code Execution

A high-severity use-after-free vulnerability in Chrome's FedCM component.

cvefeed high severityNews

Mar 24, 2026

CVE-2026-4680 - Google Chrome FedCM Use-After-Free Vulnerability

A high-severity use-after-free vulnerability in FedCM in Google Chrome that could allow remote code execution inside the sandbox via a crafted HTML page.

chrome releases blogNews

Mar 23, 2026

Chrome Releases: Stable Channel Update for Desktop

A high-severity use-after-free vulnerability in Chrome FedCM.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity8

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-4680

NVD

nvd.nist.gov/vuln/detail/CVE-2026-4680

MITRE CWE · CWE-416

Use After Free

Vendor Advisory

chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_23.html

Permissions Required

issues.chromium.org/issues/491869946