CVE-2026-121200 in Chrome
Summary
by MITRE • 11/03/2026
Incorrect reference resolution in DevTools in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified as an incorrect reference resolution flaw within Google Chrome's DevTools component represents a significant breach in browser isolation mechanisms, specifically affecting versions prior to 157.0.8103.38. This issue stems from a logic error where the browser fails to properly validate or resolve object references during specific interactions with developer tools interfaces embedded within web pages. While Chrome employs robust sandboxing techniques designed to restrict untrusted code execution to low-privilege processes, this particular flaw allows an attacker to bypass these boundaries by manipulating how internal objects are referenced and accessed. The core technical deficiency lies in the failure of the security model to correctly distinguish between trusted developer tool contexts and untrusted web content when resolving pointers or object handles, thereby creating a pathway for privilege escalation from the renderer process to higher-privilege browser processes.
From an operational perspective, this vulnerability enables remote code execution outside the sandbox through social engineering tactics. An attacker would typically host a malicious HTML page designed to exploit this reference resolution error, often disguised as legitimate content or delivered via phishing campaigns that trick users into enabling developer tools or interacting with specific UI elements. Once triggered, the crafted payload can execute arbitrary commands on the victim's system with elevated privileges relative to the standard browser sandbox constraints. This capability is particularly dangerous because it undermines one of the primary defenses against web-based attacks, allowing malware installation, data exfiltration, or further lateral movement within a compromised environment without triggering typical security alerts associated with sandbox escapes.
In terms of industry-standard classification, this vulnerability aligns closely with CWE-20 Improper Input Validation and potentially CWE-787 Out-of-bounds Write if the reference resolution leads to memory corruption, though its primary impact is defined by the bypass of access controls which relates to CWE-269 Improvement of Privileges. The attack vector corresponds to ATT&CK technique T1059 Command and Scripting Interpreter for execution and potentially T1078 Valid Accounts or T1189 Drive-by Compromise depending on how the social engineering component is executed, as it involves leveraging user interaction to trigger code execution in a privileged context. The severity rating of Medium by Chromium reflects that while exploitation requires specific conditions such as user engagement with developer tools or crafted interfaces, the potential impact on system integrity and confidentiality remains high due to the sandbox escape nature of the flaw.
Mitigation strategies primarily involve immediate patching to version 157.0.8103.38 or later where these reference resolution checks have been hardened. Organizations should ensure that automatic updates are enabled for Google Chrome to minimize exposure windows. For environments where manual update control is necessary, IT administrators must prioritize the deployment of this specific security fix across all endpoints. Additionally, user education regarding social engineering risks remains critical; users should be advised against enabling developer tools on untrusted websites and warned about interacting with suspicious web content that attempts to manipulate browser interfaces. Implementing strict Content Security Policies can also help mitigate some aspects of such attacks by restricting the execution context of scripts, although reliance solely on CSP is insufficient given the depth of this sandbox escape vulnerability.