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CVE-2026-106366 is an incomplete-cleanup vulnerability in CustomTabs in Google Chrome for Android before version 155.0.8059.39. A remote attacker can use a crafted HTML page to bypass web origin policy, undermining browser-enforced isolation between origins. The specific cleanup operation and underlying implementation details are not available.
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An incomplete-cleanup vulnerability in Google Chrome's CustomTabs on Android permits a remote attacker to bypass web origin policy using a crafted HTML page. The Nessus plugin flags affected Debian chromium packages as vendor-unpatched. It assigns a CVSS v3 base score of 9.8 (Critical), while the quoted Chromium assessment rates the issue High.
A high-severity incomplete-cleanup vulnerability in Google Chrome's CustomTabs on Android allows a remote attacker to bypass web origin policy using a crafted HTML page. Versions before 155.0.8059.39 are affected; the version boundary indicates the flaw was addressed in that release.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.