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CVE-2026-12460 is a high-severity insufficient policy enforcement vulnerability in the File System Access component of Google Chrome prior to 149.0.7827.155. The flaw allows a remote attacker who has already compromised the renderer process to bypass site isolation by using a crafted PDF file. The issue stems from inadequate enforcement of intended security policy boundaries within File System Access, enabling a compromised renderer to cross protections that should isolate content from different sites.
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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 policy enforcement vulnerability in the File System Access API fixed in ChromeOS 151.
A high-severity insufficient policy enforcement vulnerability in Chrome's File System Access component.
A high-severity insufficient policy enforcement vulnerability in Chrome File System Access.
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.