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Vulnerability record · CVE-2021-21126 · published 9 February 2021

CVE-2021-21126: Google chrome improper input validation vulnerability

Google · Chrome

Insufficient policy enforcement in extensions in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass site isolation via a crafted Chrome Extension.

6.5 CVSS 3.1 Medium EPSS 8.7% · top 5.0% CWE-20 · Improper input validation
6.5CVSS 3.1 base score, v2 4.3
8.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Insufficient policy enforcement in extensions in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass site isolation via a crafted Chrome Extension.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html Release NotesVendor Advisory
https://crbug.com/1108126 Permissions RequiredThird Party Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21126 Third Party Advisory
https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html Release NotesVendor Advisory
https://crbug.com/1108126 Permissions RequiredThird Party Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21126 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-21126), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.