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CVE-2026-12459 is a high-severity universal cross-site scripting vulnerability in the Serial component of Google Chrome prior to version 149.0.7827.155. The issue is described as an inappropriate implementation flaw that allows a remote attacker to inject arbitrary scripts or HTML by luring a target to a crafted HTML page. Because the flaw enables script or markup injection in the browser context beyond normal origin restrictions, it constitutes a UXSS condition rather than a conventional same-origin-limited XSS issue. Chromium-based browsers that incorporate the vulnerable upstream code, including Microsoft Edge, are also affected until updated to builds containing the Chromium fix.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity inappropriate implementation vulnerability in Chrome's Serial component.
A high-severity inappropriate implementation vulnerability in Chrome Serial.
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.