Cross-origin data leak in Google Chrome Passwords
CVE-2026-12446 is a high-severity vulnerability in the Passwords component of Google Chrome prior to 149.0.7827.155. The issue is described as an inappropriate implementation / insufficient data validation flaw that allows a remote attacker to leak cross-origin data by causing a victim to load a crafted HTML page. Based on the available advisory text, the vulnerability stems from improper validation or handling of data in the Passwords component, resulting in a same-origin policy or cross-origin isolation failure that exposes data across origin boundaries. No more specific vulnerable function or code path is provided in the supplied content.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity insufficient data validation vulnerability in Chrome's Passwords component.
A high-severity insufficient data validation vulnerability in Chrome Passwords.
The version that knows your environment.
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.