CVE-2026-12456 Security feature bypass in Chrome

What is CVE-2026-12456?

CVE-2026-12456 is a medium-severity vulnerability in Google Chrome, published on 17 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security severity: High)

Weakness: CWE-20

Which versions are affected by CVE-2026-12456?

It affects 1 product.

Products include Google Chrome.

How do I fix CVE-2026-12456?

Upgrade to a fixed version.

Is CVE-2026-12456 being exploited?

There is no known exploitation of CVE-2026-12456 in the wild and no public exploit code.

Other vulnerabilities in Google Chrome

• CVE-2022-4135 Google Chromium GPU Heap Buffer Overflow Exploited Critical 9.6
• CVE-2020-16017 Google Chrome Use-After-Free Exploited Critical 9.6
• CVE-2020-16010 Google Chrome for Android UI Heap Buffer Overflow Exploited Critical 9.6
• CVE-2026-87491 Google Chromium V8 Out of Bounds Write Exploited High 8.8
• CVE-2026-85046 Google Chromium V8 Type Confusion Exploited High 8.8

All Google Chrome vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-12456, ECHO-325b-e7c6-a4d0, GHSA-hv42-745h-67mr, MINI-5x2p-q5px-f254.