CVE-2026-13966 Overview
CVE-2026-13966 is a user interface (UI) spoofing vulnerability in the History component of Google Chrome prior to version 150.0.7871.47. A remote attacker can craft a malicious HTML page that exploits the inappropriate implementation to misrepresent browser UI elements. The flaw maps to [CWE-451: User Interface (UI) Misrepresentation of Critical Information]. Successful exploitation requires user interaction with the crafted page. Google assigned this issue a Chromium security severity rating of Medium.
Critical Impact
Attackers can craft HTML pages that spoof trusted browser UI, enabling phishing and social engineering attacks against users who interact with malicious sites.
Affected Products
- Google Chrome Desktop versions prior to 150.0.7871.47
- Chromium-based browsers inheriting the vulnerable History implementation
- All operating systems supported by Chrome Desktop (Windows, macOS, Linux)
Discovery Timeline
- 2026-06-30 - CVE-2026-13966 published to NVD
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-13966
Vulnerability Analysis
The vulnerability resides in the History component of Google Chrome. An inappropriate implementation allows a remote attacker to manipulate how history-related UI elements render when a user visits a crafted HTML page. The issue is classified under [CWE-451], which addresses misrepresentation of critical security information in the user interface.
UI spoofing flaws let attackers project a false trust context to the user. In this case, the attacker leverages History behaviors to influence what Chrome displays, potentially masking the true origin or intent of a page. The vulnerability does not grant code execution or data theft on its own. Instead, it becomes a building block for phishing chains and credential harvesting operations.
Exploitation requires the victim to load or interact with attacker-controlled content. No authentication is required on the attacker side, and the attack is delivered over the network through standard web navigation.
Root Cause
The root cause is inappropriate implementation logic within Chrome's History subsystem. The component fails to enforce the boundary between attacker-controlled page content and trusted browser UI surfaces. Technical specifics are tracked in the Chromium Issue Tracker Entry.
Attack Vector
The attack vector is network-based. An attacker hosts a crafted HTML page and lures a target to visit it through phishing, malvertising, or a compromised site. When the user interacts with the page, the History component renders spoofed UI content. The user may then trust the misleading indicators and disclose credentials, approve prompts, or navigate to attacker-controlled resources.
No verified public exploit code is available for this CVE. See the Chromium Issue Tracker Entry and the Google Chrome Desktop Update advisory for technical context.
Detection Methods for CVE-2026-13966
Indicators of Compromise
- Chrome Desktop clients running versions earlier than 150.0.7871.47 in the environment
- Browser telemetry showing repeated navigation to pages that manipulate history state through history.pushState or history.replaceState
- User reports of URL bar or navigation UI inconsistencies after visiting external links
Detection Strategies
- Inventory installed Chrome versions across managed endpoints and flag hosts below 150.0.7871.47
- Monitor proxy and DNS logs for user navigation to newly registered domains that host suspicious HTML content
- Correlate phishing report submissions with browser version data to identify at-risk users
Monitoring Recommendations
- Ingest endpoint browser inventory data into your SIEM to track patch compliance for Chrome
- Alert on execution of Chrome processes that lack the fixed build number after the patch deadline
- Review web gateway logs for HTML payloads that heavily manipulate browser history APIs
How to Mitigate CVE-2026-13966
Immediate Actions Required
- Update Google Chrome Desktop to version 150.0.7871.47 or later on all managed endpoints
- Verify that Chrome auto-update policies are enabled and not blocked by group policy or network egress rules
- Communicate phishing awareness guidance to users, emphasizing verification of URLs before entering credentials
Patch Information
Google addressed CVE-2026-13966 in Chrome Desktop 150.0.7871.47. Refer to the Google Chrome Desktop Update advisory for release details and rollout guidance.
Workarounds
- Restrict user navigation to untrusted sites through web filtering policies until patch deployment completes
- Enforce Chrome enterprise policies that disable or restrict less-used history features where feasible
- Deploy phishing-resistant authentication such as FIDO2 to reduce the impact of successful UI spoofing
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
