CVE-2026-13945: Chrome Linux Extension UI Spoofing – Patch Guidance & Risk Assessment

Technical summary

The vulnerability stems from inadequate policy enforcement mechanisms in Chrome's extension validation layer on Linux platforms. Specifically, the extension framework fails to properly restrict how crafted extensions can manipulate the user interface, allowing malicious extensions to spoof legitimate Chrome UI elements. This is categorized under CWE-451 (User Interface (UI) Misrepresentation of Critical Information), indicating that the core issue is about how interface elements are validated and displayed. The CVSS 3.1 score of 3.1 (LOW severity) reflects that exploitation requires user interaction, the attacker has no direct privileges, and the attack complexity is moderate (the user must be convinced to install a malicious extension).

Business impact

The practical risk to organizations depends heavily on extension deployment policies. If your enterprise allows users to install arbitrary extensions from the Chrome Web Store or elsewhere, this vulnerability creates a risk vector for credential theft or information disclosure through UI spoofing attacks. For example, a malicious extension could create a fake login prompt overlaid on legitimate Chrome UI to harvest credentials. However, the impact is limited to information integrity (spoofing) rather than confidentiality or availability—no data theft or system outage is possible through this flaw alone. Organizations with strict extension allowlisting policies face minimal risk.

Affected systems

Google Chrome running on Linux systems prior to version 150.0.7871.47 are affected. The vulnerability is specific to the Linux platform and does not affect Chrome on Windows or macOS according to the advisory details. If your environment uses managed Chrome deployments with controlled extension policies, or if you enforce a blocklist of all extensions, this vulnerability's practical impact is reduced. Note that the Linux kernel itself is listed in the affected products taxonomy but is not directly involved in this flaw—the issue is Chrome's extension policy enforcement.

Exploitability

This vulnerability has a low to moderate exploitability barrier. An attacker must first convince a user to install a malicious extension, which requires social engineering (phishing, misdirection, fake download pages, etc.). Once installed, the malicious extension can perform UI spoofing without requiring further user action or elevated privileges. The attack is not remotely exploitable—it requires direct user involvement in the installation step. It is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, suggesting no active in-the-wild exploitation has been reported at time of publication.

Remediation

Update Google Chrome on Linux systems to version 150.0.7871.47 or later. If your organization manages Chrome deployments, ensure automatic updates are enabled or perform manual updates across your fleet promptly. Complementary controls include: (1) educating users about the risks of installing extensions from untrusted sources, (2) using Chrome's Enterprise policies to restrict extension installations to an approved allowlist, (3) disabling extensions entirely if not required for business purposes, and (4) monitoring extension activity for signs of UI manipulation or fraudulent behavior.

Patch guidance

Deploy Chrome version 150.0.7871.47 or later to all affected Linux systems. If your organization uses Google's Update Service, no additional action may be needed beyond ensuring auto-updates are enabled. For manual deployments, verify the version number in Chrome's About menu (chrome://about) or via command line (google-chrome --version). Test the patch in a non-production environment first if you have business-critical extensions that may be affected by policy enforcement changes. Organizations using Chromebook devices with auto-updates enabled should be automatically patched; verify completion across your fleet.

Detection guidance

Monitor for extension installations from unexpected or unauthorized sources using Chrome's extension management API or enterprise logging if available. Look for extensions requesting excessive permissions or requesting access to UI frame manipulation. If Chrome enterprise logs are available, search for policy violations or extension-related warnings. On individual systems, users can review installed extensions at chrome://extensions and check for unfamiliar or suspicious items. Security tools can monitor for suspicious Chrome processes or unusual file modifications in the Chrome extensions directory (typically ~/.config/google-chrome/Default/Extensions on Linux). No specific file hashes or behavioral signatures are available in the current advisory.

Why prioritize this

This vulnerability merits low priority for most organizations. The CVSS score is 3.1 (LOW), exploitation requires social engineering and user action, and no active exploitation has been reported. Prioritize resources toward patching only if: (1) your user base has high risk of clicking malicious extension links, (2) you do not currently enforce extension allowlisting, or (3) you operate sensitive environments where UI spoofing could enable credential harvesting. Standard patch management cycles (monthly or quarterly) are appropriate for this issue. Do not deprioritize security awareness training, however—the social engineering component is the real attack vector.

Risk score, explained

The CVSS 3.1 score of 3.1 reflects: Attack Vector (Network) = the extension can be distributed online; Attack Complexity (High) = social engineering required; Privileges Required (None) = no system access needed; User Interaction (Required) = user must install the extension; Scope (Unchanged) = impact limited to the browser; Confidentiality (None) = no data disclosure; Integrity (Low) = UI spoofing can mislead but not permanently alter data; Availability (None) = no denial of service. The LOW severity rating appropriately captures that this is a social engineering vulnerability with limited technical depth.

Frequently asked questions