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Vulnerability record · CVE-2026-121242 · published 3 November 2026

CVE-2026-121242: Google chrome improper input validation vulnerability

Google · Chrome

Improper input validation in WebPackaging in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via crafted network traffic. (Chromium security severity: Medium)

6.5 CVSS 3.1 Medium EPSS 0.21% · top 89.0% CWE-20 · Improper input validation
6.5CVSS 3.1 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
9 Nov 2026Last modified by NVD

Description

Improper input validation in WebPackaging in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via crafted network traffic. (Chromium security severity: Medium)

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

Affected products

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

References

LinkTags
https://chromereleases.googleblog.com/2026/11/stable-channel-update-for-desktop.html Release NotesVendor Advisory
https://issues.chromium.org/issues/566857543 Permissions Required

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

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Source: NIST National Vulnerability Database (record CVE-2026-121242), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.