CVE-2026-106427: 
Google Chrome vulnerability analysis and mitigation

CVE-2026-106427 is a confused deputy vulnerability in the Mobile component of Google Chrome on iOS that allows a remote attacker to bypass system access restrictions and gain access to privileged pages via a crafted HTML page. It affects all versions of Google Chrome on iOS prior to 155.0.8059.39, reported internally by Google on 2026-05-15 and publicly disclosed on 2026-10-06 as part of a large Chrome stable channel update. The vulnerability carries a CVSS v3.1 base score of 5.4 (Medium) and is rated Low severity by the Chromium security team (Chrome Release, Feedly).

The vulnerability is classified as CWE-441 (Unintended Proxy or Intermediary / 'Confused Deputy'), where the Mobile component of Chrome on iOS incorrectly acts on behalf of a less-privileged context, allowing it to access resources or pages that should be restricted. An attacker exploits this by serving a crafted HTML page to a victim, which causes the browser's Mobile component to act as an intermediary and navigate to or interact with a privileged internal page that would otherwise be inaccessible. No privileges are required on the attacker's side, but user interaction (visiting the malicious page) is a prerequisite. The bug was tracked internally as Chromium issue 513423334 (Chrome Release, Red Hat Bugzilla).

Successful exploitation allows an unauthenticated remote attacker to bypass system access restrictions and gain unauthorized access to privileged pages within Chrome on iOS, resulting in limited confidentiality and integrity impacts (CVSS: C:L/I:L/A:N). The scope is limited to the affected browser instance on iOS; there is no availability impact and no evidence of lateral movement potential beyond the browser context. The technical impact is assessed as partial by NVD's SSVC analysis (Feedly).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of disclosure. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, and NVD's SSVC assessment indicates exploitation is 'none' and the vulnerability is not automatable. The EPSS score is approximately 0.00178 (very low probability of exploitation in the near term) (Feedly).

Google has addressed this vulnerability in Chrome version 155.0.8059.39 for iOS. Users and administrators should update Google Chrome on iOS to version 155.0.8059.39 or later immediately. Organizations managing iOS devices should enforce automatic Chrome updates via mobile device management (MDM) policies to ensure timely patching. No configuration-based workaround is available; updating to the patched version is the only recommended remediation (Chrome Release).

The vulnerability was part of a large Chrome stable channel update addressing 247 security fixes, which received coverage from security aggregators including CIS, Tenable, and AusCERT. Red Hat tracked the issue via Bugzilla with low priority and severity, consistent with the Chromium team's own Low severity rating. No notable independent researcher commentary or significant social media discussion specific to this CVE has been identified (CIS Advisory, Red Hat Bugzilla).