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Vulnerability record · CVE-2021-21135 · published 9 February 2021

CVE-2021-21135: Google chrome origin validation error vulnerability

Google · Chrome

Inappropriate implementation in Performance API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

6.5 CVSS 3.1 Medium EPSS 19% · top 2.8% CWE-346 · Origin validation error
6.5CVSS 3.1 base score, v2 4.3
19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Inappropriate implementation in Performance API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to leak cross-origin data via a crafted HTML page.

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/1157818 Permissions RequiredThird Party Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21135 Third Party Advisory
https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html Release NotesVendor Advisory
https://crbug.com/1157818 Permissions RequiredThird Party Advisory
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21135 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-2021-21135), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.