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CVE-2026-12453 Google CVE debrief

CVE-2026-12453 is a vulnerability in Google Chrome prior to version 149.0.7827.155. The issue involves insufficient validation of untrusted input in the Input component, allowing a remote attacker who has compromised the renderer process to bypass the same origin policy via a crafted HTML page. This vulnerability has been classified as High severity by Chromium and Medium by CVSS with a score of 4.2.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.2
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

This vulnerability affects users of Google Chrome. As the vulnerability allows for bypassing the same origin policy, which is a critical security mechanism for isolating different origins, users who browse the web using Google Chrome are at risk. Specifically, those who may interact with crafted HTML pages from untrusted sources should be cautious.

Technical summary

The vulnerability, CVE-2026-12453, is caused by insufficient validation of untrusted input in the Input component of Google Chrome. This allows a remote attacker who has already compromised the renderer process to bypass the same origin policy. The same origin policy is a key security feature implemented in web browsers to prevent malicious scripts from one origin from accessing or manipulating data from another origin. By bypassing this policy, an attacker could potentially access or manipulate sensitive data belonging to the user, leading to privacy and security breaches.

Defensive priority

High

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.155 or later to patch the vulnerability.
  • Ensure that Google Chrome is set to automatically update to ensure you receive the latest security patches.
  • Users should exercise caution when visiting untrusted websites or interacting with links from unknown sources to minimize the risk of exploitation.
  • Confirm whether affected Google Chrome deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record was published on 2026-06-17T13:20:00.793Z and was last modified on 2026-06-17T15:21:33.707Z. The vulnerability has been analyzed and detailed information is available from official sources including the NVD and Google's Chrome release blog.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12453 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12453

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12453 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12453

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.