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CVE-2026-12459 Google CVE debrief

CVE-2026-12459 is a High-severity vulnerability in Google Chrome's Serial implementation. A remote attacker can inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. This issue was patched in Chrome version 149.0.7827.155. Users should update Chrome to the latest version to mitigate this risk. The vulnerability has a CVSS score of 6.1, indicating a Medium severity level. Chrome users are advised to exercise caution when visiting untrusted websites.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-06-17
Advisory published
2026-06-17
Advisory updated
2026-06-17

Who should care

Users of Google Chrome, particularly those who frequently visit untrusted websites or handle sensitive data online, should be aware of this vulnerability and update their browsers to the latest version. IT administrators responsible for managing Chrome deployments should prioritize patching to prevent potential attacks.

Technical summary

The vulnerability, tracked as CVE-2026-12459, is caused by inappropriate implementation in the Serial component of Google Chrome. This allows a remote attacker to inject arbitrary scripts or HTML, leading to UXSS (Universal Cross-Site Scripting). The issue was resolved in Chrome version 149.0.7827.155. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating a Medium severity level with a score of 6.1.

Defensive priority

High

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.155 or later
  • Exercise caution when visiting untrusted websites
  • Avoid handling sensitive data on potentially compromised websites
  • Consider implementing a web filtering solution to block malicious websites
  • Regularly update Chrome and other software to ensure latest security patches
  • Monitor Chrome for any suspicious activity or anomalies

Evidence notes

This debrief is based on information from the official CVE record and NVD detail pages. The CVE was published on 2026-06-17T13:20:02.857Z and last modified on 2026-06-17T15:20:43.163Z. The vulnerability has been analyzed and verified by the Chrome security team.

Official resources

Public