CVE-2021-30533 Google Chromium PopupBlocker: login or permission bypass
In plain words: A door that should be locked is not: part of the system can be reached without a valid login or permission. The attacker gets in as a user or administrator without knowing a password.
Confirmed exploited by CISA on · US federal patch deadline Jul 18, 2022
What to do
- Install Google's security update for Chromium PopupBlocker. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
- Keep extensions to a minimum and remove ones you do not recognise.
- Stop using Internet Explorer and any browser that no longer gets updates.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: A malicious or hacked website can be enough. Browser bugs are often the first step in a longer attack on the whole computer or phone.
The details
- Official name
- Google Chromium PopupBlocker Security Bypass Vulnerability
- Product
- Google Chromium PopupBlocker
- CISA description
- 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.
- Type of flaw
- Login or permission bypass (CWE-863)
- Confirmed exploited
- Jun 27, 2022
- US federal patch deadline
- Jul 18, 2022
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Answering about CVE-2021-30533 ·
Questions about CVE-2021-30533
Is CVE-2021-30533 being exploited?
Yes. CISA added CVE-2021-30533 to its Known Exploited Vulnerabilities catalog on Jun 27, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2021-30533?
Install Google's security update for Chromium PopupBlocker. If no update exists, follow the vendor's workaround or stop using the product until one ships. Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
Am I affected by CVE-2021-30533?
Only if you use Google Chromium PopupBlocker. This one is aimed at devices or apps of the kind people own.