CVE-2026-79105 in Chrome
Summary
by MITRE • 08/26/2026
Improper input validation in Mobile in Google Chrome on on iOS prior to 152.0.7977.65 allowed a remote attacker to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an improper input validation flaw within the Mobile version of Google Chrome on iOS represents a significant, albeit low-severity, breach in application-level security controls. This issue stems from insufficient sanitization and verification mechanisms when processing user-supplied data or external content injected into the browser environment. Specifically, the defect allows for the manipulation of internal state variables or access control lists through specially crafted HTML pages hosted by an attacker. The core technical flaw lies in the failure to strictly enforce boundary checks on input parameters before they are processed by the rendering engine or JavaScript execution context. This lack of rigorous validation enables a remote adversary to exploit logical inconsistencies within the browser's permission handling subsystem, effectively tricking the application into granting access privileges that should otherwise be restricted by system-level policies.
From an operational perspective, this vulnerability facilitates unauthorized bypasses of iOS sandbox restrictions and Chrome’s own security boundaries. An attacker can construct a malicious webpage containing specific HTML elements or scripts designed to trigger the validation failure. When a user visits this page while using Google Chrome on their iOS device, the browser may inadvertently expose sensitive system resources or internal APIs that are not intended for public access. This bypass capability undermines the principle of least privilege, potentially allowing the extraction of private data, modification of local storage contents, or execution of actions with elevated permissions without explicit user consent. The severity is classified as low primarily because successful exploitation typically requires social engineering to lure a victim into visiting the crafted page and may be limited by iOS’s broader sandboxing architecture, which still provides some layer of protection against full system compromise.
This incident aligns closely with CWE-20 Improper Input Validation, where software fails to verify that input data meets expected criteria before processing it. Furthermore, the exploitation technique maps to MITRE ATT&CK techniques related to client-side attacks and privilege escalation within application contexts. The attack vector is classified as remote because no local access or prior authentication on the target device is required beyond having Chrome installed. However, the interaction model remains interactive, requiring a user to navigate to the malicious site. This distinction highlights that while the technical flaw exists in the codebase, its real-world impact is contingent upon human behavior and browsing habits.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary corrective action involves updating Google Chrome on iOS to version 152.0.7977.65 or later, where this input validation logic has been corrected by the Chromium security team. Users should ensure automatic updates are enabled to receive patches promptly as they become available. From a defensive engineering standpoint, developers must implement strict allow-listing for all inputs and enforce context-aware sanitization routines that validate data types, lengths, and formats against predefined schemas before any processing occurs. Additionally, implementing Content Security Policy headers can help mitigate the impact of such vulnerabilities by restricting the sources from which scripts and other resources are loaded, thereby reducing the attack surface available to remote adversaries attempting similar exploits in the future.