CVE-2026-10010: Chrome Android Site Isolation Bypass

Technical summary

CVE-2026-10010 stems from an inappropriate implementation in the input handling mechanism of Google Chrome on Android. The vulnerability allows a remote attacker with prior renderer process compromise to circumvent site isolation—Chrome's architectural defense that isolates each site's content in a separate operating system process. The attack vector involves serving a crafted HTML page to the victim, which leverages the existing renderer compromise to break site isolation boundaries. The underlying issue is classified under CWE-346 (Origin Validation Error), indicating improper enforcement of origin-based access controls.

Business impact

For enterprise environments deploying Chrome on Android devices, this vulnerability creates a compounded risk scenario: if another vulnerability or attack vector first compromises the Chrome renderer, this flaw then enables attackers to access cross-site data they should not reach. This could lead to credential theft, session hijacking, or exfiltration of sensitive information across multiple websites within a single compromised browser instance. Organizations relying on Android mobile security for BYOD or managed device programs should assess their exposure and prioritize patching.

Affected systems

Google Chrome for Android versions prior to 148.0.7778.216 are affected. This includes all stable and extended release tracks below that version number on Android platforms. Desktop Chrome and Chrome on other platforms are not mentioned in this advisory and should not be assumed vulnerable to this specific flaw. Organizations should inventory Chrome version distributions across their Android device fleet, including both corporate-managed and BYOD devices if applicable.

Exploitability

Exploitation requires two conditions: (1) the attacker must first compromise the Chrome renderer process through a separate vulnerability or attack, and (2) the victim must then visit a malicious HTML page served by the attacker. The CVSS vector reflects this two-stage requirement: the attack has High Complexity (AC:H) due to the prerequisite renderer compromise, requires no privileges (PR:N), but does need user interaction (UI:R) to visit the crafted page. The practical exploitability is therefore limited to multi-stage attack chains rather than standalone drive-by compromise, lowering real-world risk compared to single-stage flaws.

Remediation

Update Google Chrome on Android to version 148.0.7778.216 or later. For organizations managing Android devices through MDM solutions, deploy this version through your mobile device management console. For BYOD scenarios, communicate the update requirement to users and verify adoption through your security telemetry. No workarounds are available; patching is the only mitigation.

Patch guidance

Deploy Chrome version 148.0.7778.216 or later across all Android devices in your environment. If using Google's Managed Chrome browser for Android, ensure your MDM policies are configured to auto-update or force minimum version enforcement. Verify patch compliance within 30 days of release through your device inventory and reporting tools. Test the update on a representative sample of devices first to ensure app stability with your organization's web applications.

Detection guidance

Monitor Chrome crash reports and renderer process termination logs on Android devices, as renderer compromise attempts may generate forensic signals. Cross-reference device activity logs with known exploit campaigns or suspicious JavaScript injection attempts. Watch for unusual cross-origin data access patterns in application logs. However, this vulnerability produces minimal behavioral signals once an attacker has already achieved renderer compromise; detection is most effective at the initial renderer compromise stage through standard malware and exploit scanning. Correlation with other Android security events may indicate a staged attack.

Why prioritize this

Although the CVSS score is MEDIUM (5.0), this vulnerability should be prioritized because: (1) site isolation is a foundational Chrome security model that protects sensitive enterprise data; (2) it affects the mobile platform where Chrome is heavily deployed for both corporate and consumer use; (3) the Chromium security team rated it High severity; and (4) it enables post-compromise escalation of damage. Organizations should treat this as a standard-cycle patch but not delay beyond normal update windows.

Risk score, explained

The CVSS 3.1 score of 5.0 (MEDIUM) reflects the two-stage attack requirement: High Complexity (AC:H) due to the prerequisite renderer process compromise significantly reduces the base score. However, the vulnerability does enable Confidentiality, Integrity, and Availability impact (C:L, I:L, A:L) once that initial compromise exists. The score appropriately captures that this is a post-compromise escalation flaw rather than an independent attack vector. The Chromium team's separate High severity rating acknowledges the security model importance of site isolation, even though CVSS reflects the practical exploitability difficulty.

Frequently asked questions