Live › vulnerability › CVE-2021-30533
Go to dashboardChromium's popup blocker has an insufficient policy enforcement flaw that lets a remote web page bypass navigation restrictions using a crafted iframe. An attacker gets a page that can navigate or open content it should be blocked from, and the flaw is listed as actively exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Google Chromium PopupBlocker | vendor | – | – |
| google chrome | vendor | < 91.0.4472.77 | 91.0.4472.77 |
| fedoraproject fedora | vendor | = 33 | – |
| fedoraproject fedora | vendor | = 34 | – |
Check the installed browser version against the vendor's patched release (sources do not give the fixed version).
Update Chrome, Edge, Opera and other Chromium-based browsers to the latest vendor release, as CISA directs.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Google Chromium PopupBlocker contains an insufficient policy enforcement vulnerability that allows a remote attacker to bypass navigation restrictions via a crafted iframe. 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.
This page as .md · .json · in your agent: get_signal("CVE-2021-30533")
CISA KEV catalog, Creative Commons 0 · EPSS scores by FIRST, used with attribution · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.