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CVE-2021-21139: Inappropriate implementation in iframe sandbox in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page.

CVE-2021-21139 · published 5 years ago

Summary

Inappropriate implementation in iframe sandbox in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page.

What to do

Update google chrome to version 88.0.4324.96 or later.
Update microsoft edge_chromium to version 88.0.705.50 or later.

Affected software

Vendor	Product	Affected versions
google	chrome	< 88.0.4324.96 `cpe:2.3:a:google:chrome::::::::`
microsoft	edge_chromium	< 88.0.705.50 `cpe:2.3:a:microsoft:edge_chromium::::::::`

Original advisory text

Inappropriate implementation in iframe sandbox in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass navigation restrictions via a crafted HTML page.

References

https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_... Release Notes Vendor Advisory
https://crbug.com/937131 Exploit Issue Tracking Patch Vendor Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21139 Third Party Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

6.5 Medium

Exploitation

5% chance of attack within 30 days

Type

CWE-1021Improper Restriction of Rendered UI Layers or Frames

Timeline

Published9 Feb 2021

Updated4 Nov 2026

First seen29 Sep 2026

Sources

CVE-2021-21139 · NVD

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