CVE-2026-11018: Chrome Navigation Policy Bypass (6.5 CVSS)

Technical summary

CVE-2026-11018 stems from insufficient policy enforcement in Chrome's navigation actor component. The vulnerability permits a remote attacker to circumvent navigation restrictions through a specially crafted HTML page. The underlying weakness (CWE-602: Client-Use-of-Dangerous-API) indicates that Chrome's navigation policy enforcement logic can be bypassed under specific conditions. With a CVSS 3.1 base score of 6.5 and a vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N, the flaw is network-exploitable, requires low attack complexity, needs no prior privileges, but does require user interaction. The impact is high on integrity (the attacker can force navigation to attacker-controlled or blocked destinations) with no confidentiality or availability impact. Chromium's security team rated this as Medium severity.

Business impact

Users running vulnerable Chrome versions are exposed to navigation-based attacks that could lead to credential theft, malware infection, or unauthorized access to sensitive resources. If your workforce relies on Chrome to access internal or restricted web properties, an attacker could redirect traffic to lookalike sites during a session, increasing phishing risk. The requirement for user interaction means attacks depend on social engineering or drive-by hosting, but the low barrier to crafting a malicious page makes this a practical threat. Organizations without rapid patching processes could experience increased support tickets and potential compromise of user credentials.

Affected systems

Google Chrome on Windows, macOS, and Linux systems running versions prior to 149.0.7827.53 are affected. The vulnerability also affects Chromium-based browsers that incorporate the same navigation policy code from affected Chromium versions, as well as systems relying on embedded Chrome components. End users, remote workers, and any individual accessing the web through vulnerable Chrome builds are at risk. Verify your organization's Chrome deployment version against the 149.0.7827.53 threshold.

Exploitability

Exploitation is straightforward in terms of attack mechanics: an attacker needs only to host a specially crafted HTML page and trick or lure a user into visiting it. No authentication, no advanced techniques, and no out-of-bounds primitives are required. The attack surface is broad because any website, advertisement, or link can be weaponized. However, the requirement for user interaction (clicking a link, loading a page) provides a limited window for user awareness and defense. The ease of crafting and hosting such pages, combined with the low friction of web-based delivery, makes this vulnerability moderately exploitable in real-world conditions. It is not trivial to exploit (it requires social engineering), but neither does it demand specialized skills.

Remediation

Upgrade Google Chrome to version 149.0.7827.53 or later. Most modern Chrome deployments auto-update, but verify the update has been applied, especially in environments with managed Chrome deployments or deferred update policies. For macOS users, ensure system updates for any embedded Chrome components are applied. For Linux users, verify package repositories or manual installations are at or above the fixed version. Test the update in a pilot group before broad rollout to confirm no compatibility issues with internal applications. Monitor the Chrome browser to confirm the version number in Settings > About Chrome.

Patch guidance

Google Chrome typically rolls out security patches automatically; users should restart the browser or restart their systems to complete the update process. For enterprise deployments, verify that your update deployment mechanism (Microsoft Intune, JAMF, Puppet, etc.) is configured to push Chrome updates promptly. If you use older or long-support release channels, confirm they have been updated to 149.0.7827.53 or the equivalent ESR version. Check Chrome's release notes and security advisories for any unrelated regressions introduced in 149.0.7827.53 before mandating the update enterprise-wide.

Detection guidance

Monitor for users accessing suspicious or unusual URLs after opening Chrome, particularly links from untrusted sources (spam, unsolicited email, etc.). Endpoint Detection and Response (EDR) solutions should flag unusual navigation or process spawning patterns related to Chrome. Network monitoring can identify outbound connections to known phishing or malware domains immediately after a Chrome navigation event. Review browser history logs and HTTP proxy records for redirections to unexpected destinations. Behavioral analysis tools may detect patterns consistent with navigation-based attacks (e.g., rapid successive navigation events to unrelated domains in a short time window). No specific signature is necessary; focus on user behavior anomalies tied to browser navigation.

Why prioritize this

Although this vulnerability has a Medium CVSS score and does not appear on CISA's Known Exploited Vulnerabilities (KEV) catalog, the ease of exploitation and the ubiquity of Chrome in enterprise and consumer environments warrant prompt attention. The low barrier to crafting a malicious page and the reliance on social engineering—which is highly effective—means this flaw will likely be exploited opportunistically. The integrity impact is significant for users handling sensitive data or accessing restricted resources. Prioritize patching for systems used by high-value targets (finance teams, HR, executives) and then roll out to the broader user base.

Risk score, explained

The CVSS 3.1 base score of 6.5 reflects a Medium-severity network-exploitable flaw with no authentication required, user interaction mandatory, and high integrity impact but no confidentiality or availability loss. This score appropriately captures the practical risk: while the technical severity is not Critical, the ubiquity of Chrome and the low friction of delivering an attack make the real-world risk more substantial than a standalone Medium rating might suggest. The absence of KEV designation indicates no known active exploitation as of the publication date, but organizations should not interpret this as a reason to delay patching.

Frequently asked questions