---
id: "CVE-2021-38000"
kind: "vulnerability"
aliases: ["CVE-2021-38000"]
title: "Google Chromium Intents: Google Chromium Intents Improper Input Validation Vulnerability"
severity: "medium"
cvss: 6.1
epss: 0.04948
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Google Chromium Intents", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["browser-users", "chrome", "chromium", "edge", "exploited", "opera", "vendor"]
not_affected_if: ["fully-patched-browser"]
published_at: "2021-11-03T00:00:00+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-38000", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-38000", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38000", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Google Chromium Intents: Google Chromium Intents Improper Input Validation Vulnerability

An improper input validation flaw in Chromium's Intents handling lets a crafted HTML page make the browser navigate to an attacker-chosen URL. CISA lists it as actively exploited, and the same flaw affects Chromium-based browsers such as Chrome, Edge and Opera.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Google Chromium Intents affected ? fixed ?

## How to check

Check the installed browser version (chrome://version, edge://version, or opera://about) and compare it with the fixed release in the vendor advisory.

## Fix

Update Chrome, Edge, Opera and other Chromium-based browsers to the latest release per vendor instructions, as CISA requires.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-38000
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-38000
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-38000

## From the sources

Google Chromium Intents contains an improper input validation vulnerability that allows a remote attacker to arbitrarily browser to a malicious URL via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

CISA required action: Apply updates per vendor instructions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_