CVE-2026-11244: Chrome WebAuthentication Input Validation Bypass

Technical summary

This vulnerability stems from insufficient input validation in WebAuthentication, tracked as CWE-20. The flaw permits an attacker controlling the compromised renderer process to submit crafted HTML that bypasses same-origin policy protections. The attack surface is constrained by the prerequisite of renderer compromise and user engagement with the malicious page. Chrome versions prior to 149.0.7827.53 are affected. The CVSS 3.1 score of 3.1 (Low) reflects low attack complexity, requirement for high-privilege prerequisites, and limited confidentiality impact with no integrity or availability impact.

Business impact

The business risk is minimal given the low CVSS score and high attack prerequisites. This vulnerability does not enable mass exploitation or zero-click attacks. Organizations using Chrome do not face immediate operational risk unless their environment already contains compromised renderer processes—a severe condition indicating prior intrusion. The disclosure is important for completeness in patch management workflows but should not trigger emergency response procedures.

Affected systems

Google Chrome versions prior to 149.0.7827.53 are directly affected. The vulnerability also lists macOS, Linux kernel, and Windows as affected operating systems, likely because Chrome runs cross-platform and these systems host the vulnerable browser. The underlying flaw is in Chrome's WebAuthentication implementation, not in the operating systems themselves.

Exploitability

Exploitation requires a combination of unfavorable conditions: an attacker must first have compromised the Chrome renderer process (a severe prerequisite), then craft a specific HTML page, and finally trick a user into viewing it. The attack vector is network-based but demands high attack complexity and user interaction. No public exploit code has been disclosed, and the vulnerability is not tracked in the CISA Known Exploited Vulnerabilities (KEV) catalog, suggesting minimal real-world exploitation risk at this time.

Remediation

Update Google Chrome to version 149.0.7827.53 or later. This update addresses the input validation deficiency in WebAuthentication. Verify the update through Chrome Settings > About Chrome, which will check for and automatically install the latest version. Organizations managing Chrome deployments should prioritize this patch in their standard update cycles rather than as an emergency fix.

Patch guidance

Google Chrome auto-updates on most platforms, but administrators should verify deployment in managed environments. Check the official Chrome release notes to confirm version 149.0.7827.53 availability for your operating system. For enterprise deployments, use Chrome's update policies to ensure timely distribution. This is a routine security update and does not require special compatibility testing.

Detection guidance

Organizations can monitor Chrome version distribution across their estate to identify systems below version 149.0.7827.53. Additionally, monitor for anomalous renderer process crashes or unexpected WebAuthentication behavior in browser logs. However, detection of active exploitation is difficult without renderer-level instrumentation, which is typically beyond standard browser telemetry. Focus detection efforts on identifying and remediating any broader renderer process compromises, which would be a more significant security concern.

Why prioritize this

This vulnerability warrants routine priority rather than urgent action. The low CVSS score, high attack prerequisites, lack of KEV listing, and absence of public exploitation make it a standard patch-management item. However, do not defer indefinitely—include it in the next scheduled Chrome update cycle. If your organization detects renderer process compromise from any source, patching this vulnerability becomes part of incident response containment.

Risk score, explained

The CVSS 3.1 score of 3.1 reflects: network attack vector (AV:N) balanced by high attack complexity (AC:H) due to prerequisite compromises; no privilege escalation required (PR:N) but user interaction mandatory (UI:R); limited confidentiality impact (C:L) with no integrity or availability loss (I:N/A:N). The score appropriately captures this as a minor security concern within the larger context of renderer process security.

Frequently asked questions