CVE-2022-2856: Google Chromium Intents Insufficient Input Validation Vulnerability

CVE-2022-2856 is an insufficient input validation weakness in Google Chromium Intents. A remote attacker can abuse it with a crafted HTML page so that the browser navigates to a malicious website. Because many browsers embed Chromium, the issue can affect Google Chrome, Microsoft Edge, Opera, and other Chromium-based products. IT and security teams should treat it as a browser-level risk that can lead users to attacker-controlled content and should confirm exact impact and fixes against the vendor advisory.

How it works

The flaw is classified as CWE-20, insufficient validation of untrusted input. Chromium Intents handle certain navigation or protocol-related actions. When input supplied through a crafted HTML page is not adequately checked, the browser can be directed to browse to a site chosen by the attacker. Public detail does not describe low-level exploit mechanics or memory corruption; the documented outcome is unwanted navigation to malicious content. An attacker would typically need the victim to open or render the malicious page in a vulnerable Chromium-based browser. No further exploit specifics are provided in the available record, so defenders should rely on the vendor advisory for technical depth rather than assuming particular attack chains.

Am I affected? How to find it in your systems

Chromium Intents ship inside Chromium-based browsers commonly installed on endpoints, VDI images, kiosks, and developer workstations. Inventory every browser that embeds Chromium—Google Chrome, Microsoft Edge, Opera, and any other Chromium derivative used in your environment. Check installed versions and update channels against the vendor security bulletins for each product; the CVE record itself does not list version ranges, so those must be confirmed in the official advisories. Configuration management, software inventory tools, or endpoint management agents can enumerate browser packages and build numbers. Review browser and proxy logs for unexpected navigations or redirects that coincide with users opening untrusted HTML or web content. Telemetry showing sudden visits to unfamiliar domains after local HTML rendering may warrant investigation, but such signs are not unique to this CVE and require correlation with other indicators.

• Enumerate Chromium-based browsers across managed and unmanaged endpoints.
• Compare installed builds to the fixed versions published by each vendor.
• Inspect enterprise browser policies and extension inventories for additional exposure surface.
• Watch proxy, DNS, and EDR logs for anomalous post-render navigations.

How to remediate

Apply the vendor updates that address CVE-2022-2856 as instructed in the official security advisories for each affected browser. CISA’s required action is to apply updates per vendor instructions; that remains the primary fix. After patching, verify that endpoints report the remediated build. For this class of input-validation weakness, also enforce least-privilege browser policies, keep automatic updates enabled where operationally feasible, and restrict the ability of untrusted HTML or local files to trigger privileged navigation handlers. Remove or disable unused Chromium-based browsers to shrink the attack surface. Re-scan inventory after deployment to confirm coverage.

If you can't patch immediately

Until updates can be deployed, reduce risk with compensating controls. Segment high-risk user populations and limit their ability to open untrusted local HTML. Where supported, use enterprise browser policies or extension controls to constrain intent handling and external protocol launches. Virtual patching or WAF/proxy rules that block known malicious landing pages can help but will not fully substitute for the browser fix. Increase monitoring of web navigation and process creation from browser parents. Disable or tightly control features that allow crafted pages to drive navigation if your environment permits it. These steps only buy time; schedule the vendor update as soon as possible.

• Network segmentation and restricted browsing for vulnerable hosts.
• Policy-based hardening of intent and protocol handlers.
• Heightened logging and alerting on suspicious navigations.
• Temporary disablement of non-essential browser features that process untrusted input.

If your data may have been exposed

Actively exploited browser vulnerabilities can be used to deliver further malware or phishing that leads to data theft. Ransomware use is not documented for this CVE. If you suspect compromise, follow normal incident response: isolate affected hosts, preserve browser and system logs, and reset credentials that may have been entered on malicious sites. You can run a free exposure scan of your email addresses against known breach data to check whether associated accounts appear in prior breaches while you complete containment and recovery.