CVE-2026-13818: Google Chrome Password Navigation Bypass Vulnerability

Technical summary

CVE-2026-13818 is an inappropriate implementation vulnerability in the Passwords component of Google Chrome. The flaw resides in navigation restriction logic, enabling a remote attacker to bypass intended security boundaries via crafted HTML. The vulnerability is classified as CWE-284 (Improper Access Control), reflecting a breakdown in the browser's enforcement of navigation policies. Exploitation requires network access and user interaction (visiting a malicious page), but no special privileges or system-level complexity. Chromium's security team assigned this a High severity rating internally, though the CVSS v3.1 score of 6.5 reflects moderate impact primarily in the integrity domain.

Business impact

Organizations relying on Chrome as a standard browser face a heightened phishing risk until patches are deployed. Attackers could craft convincing fake pages that exploit this flaw to redirect users away from legitimate login portals, increasing credential compromise likelihood. The requirement for user interaction limits mass-exploitation scenarios, but targeted campaigns against high-value employees remain feasible. Financial services, healthcare, and other regulated sectors should prioritize mitigation to reduce compliance and fraud risk.

Affected systems

All Google Chrome installations prior to version 150.0.7871.47 are vulnerable. This includes Chrome on Windows, macOS, Linux, Android, and iOS platforms. Chrome Enterprises and consumer users are equally at risk. Organizations using Chrome as a managed browser should verify their deployment version and enforce auto-update policies to accelerate coverage.

Exploitability

The vulnerability requires a remote attacker to host or inject a crafted HTML page and convince a user to visit it—a low technical barrier but moderate social engineering lift. No zero-day exploits are currently documented in public sources, and the flaw does not enable code execution or privilege escalation. However, the low attack complexity and lack of required privileges make it a practical vector for phishing and social engineering campaigns, particularly when combined with spear-phishing emails or compromised advertising networks.

Remediation

Update Google Chrome to version 150.0.7871.47 or later. Most users on auto-update should receive patches automatically within days of release. Organizations should verify successful rollout via browser version reporting in their device management console. For environments with restricted update policies, assess and test the new version in a staging environment before pushing to production to avoid compatibility issues with internal web applications.

Patch guidance

Deploy Chrome 150.0.7871.47 or a later stable release across all endpoints. If your organization uses Chrome Enterprise, verify that auto-update is enabled and monitor the Chrome Management Console for deployment progress. Test the patched version against business-critical web applications before full rollout. No known compatibility breaks have been reported for this update, but custom extensions should be validated, especially those handling authentication or navigation.

Detection guidance

Monitor browser logs and user reports of unexpected navigation behavior or redirects to unfamiliar domains. Endpoint Detection and Response (EDR) tools can flag suspicious HTML injection attempts or abnormal frame manipulation patterns. Network-level detection is limited due to the vulnerability's reliance on crafted HTML served over HTTPS, but DNS query anomalies (users visiting unexpected domains post-redirect) may surface in proxy or firewall logs. Consider deploying additional phishing detection tools and user awareness training emphasizing verification of URLs before entering credentials.

Why prioritize this

This vulnerability merits prompt but measured action. While not yet exploited in the wild (KEV status: not added) and requiring user interaction, its low barrier to exploitation and direct facilitation of phishing make it a meaningful near-term risk for organizations with high-value users or sensitive workflows. The CVSS 6.5 score reflects moderate urgency; prioritize deployment within the next patch cycle (typically 2–4 weeks for Chrome) rather than treating as an emergency zero-day.

Risk score, explained

The CVSS v3.1 score of 6.5 (Medium severity) balances multiple factors: network-based attack vector (AV:N) and low complexity (AC:L) suggest ease of exploitation, while the requirement for user interaction (UI:R) reduces the risk window. No code execution or data confidentiality impact is expected, but the high integrity impact (I:H) reflects the ability to redirect users to attacker-controlled domains. This score appropriately places the flaw above low-severity issues but below critical flaws, aligning with its real-world threat model.

Frequently asked questions