# CVE-2021-30533: Google Chromium PopupBlocker Security Bypass Vulnerability

Source: https://junglewise.ai/threats/cve-2021-30533-google-chromium-popupblocker-security-bypass-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-06-27. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-30533 · Severity: critical · CVSS 6.5 · Exploited in the wild · Published 2022-06-27

Google Chromium PopupBlocker contains an insufficient policy enforcement vulnerability that allows a remote attacker to bypass navigation restrictions via a crafted iframe. This flaw enables attackers to circumvent intended security controls in browsers based on Chromium.

Vendors: [Google](https://junglewise.ai/threats/vendors/google).

## Quick answers

**Is CVE-2021-30533 exploited in the wild?** Yes. CVE-2021-30533 is known to be exploited in the wild, first recorded on 27 June 2022. Treat it as urgent.

**How severe is CVE-2021-30533?** Critical severity, with a CVSS score of 6.5, published 27 June 2022.

**Which products and versions are affected?** Google Chrome prior to 91.0.4472.77; Microsoft Edge; Opera Opera; Fedora Project Fedora 33, 34.

**Is there a fix for CVE-2021-30533?** A patch was published on 2021-05-25: Stable channel update for desktop released. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2021-30533 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2021-30533?** Check whether you run Google Chromium Popupblocker. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Google Chrome prior to 91.0.4472.77
- Microsoft Edge
- Opera Opera
- Fedora Project Fedora 33, 34

## Timeline

- 2021-05-25: patched: Stable channel update for desktop released.
- 2022-06-27: disclosed: NVD publication date.
- 2022-06-27: kev added: Added to CISA Known Exploited Vulnerabilities catalog.
- exploited: Reported as exploited in the wild.