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CVE-2026-12456 is a high-severity vulnerability in the Extensions component of Google Chrome prior to version 149.0.7827.155. The flaw is described as an inappropriate implementation and insufficient validation of untrusted input in Chrome Extensions, allowing a crafted malicious extension to bypass the browser same-origin policy. The issue affects Chromium-based browsers that incorporated the vulnerable upstream code, including Google Chrome and Microsoft Edge. Successful exploitation requires the attacker to deliver or persuade the victim to install a malicious extension that abuses the flawed extension handling logic to access cross-origin resources in violation of normal browser isolation rules.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Extensions fixed in ChromeOS 151.
A high-severity insufficient validation of untrusted input vulnerability in Chrome Extensions.
A high-severity insufficient validation of untrusted input vulnerability in Chrome Extensions.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.