CVE-2026-79242 in Chrome
Summary
by MITRE • 08/26/2026
Observable discrepancy in HTML in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an observable discrepancy in HTML rendering within versions of Google Chrome prior to 152.0.7977.65 represents a significant class of issues related to browser state consistency and information leakage through visual or structural anomalies. This flaw stems from inconsistencies between how the Chromium engine parses, renders, or maintains internal states for specific HTML constructs compared to expected standards or previous consistent behaviors. When an attacker crafts a malicious webpage containing specially designed HTML elements, they can trigger this discrepancy in a victim's browser environment. The core technical issue lies not necessarily in arbitrary code execution but in the ability of the crafted content to expose subtle differences in rendering behavior that reveal sensitive information about the user's browsing context or internal state.
From a technical perspective, such discrepancies often arise when the browser fails to properly isolate resources or correctly apply security boundaries during the layout and painting phases of the Document Object Model processing. In many cases involving HTML-based vulnerabilities, attackers exploit race conditions, cross-origin resource sharing misconfigurations, or inconsistencies in how mixed content is handled. By manipulating these rendering paths, an attacker can cause the browser to display information that should be hidden or obscured due to security policies. This might include revealing details about open tabs, cached data visibility, or specific DOM element properties that are normally inaccessible from a cross-origin context. The severity being classified as medium by Chromium indicates that while exploitation is feasible and leads to unauthorized access of sensitive data, it likely requires user interaction such as visiting the malicious page rather than offering full system compromise through remote code execution.
The operational impact of this vulnerability centers on privacy violations and potential reconnaissance for further attacks. An attacker leveraging this flaw can obtain sensitive information about the victim's browsing habits or specific application states without direct access to their files or credentials. This type of data leakage is particularly dangerous in scenarios where users engage with multiple web applications simultaneously, as it may expose session tokens, personal identifiers, or internal network configurations visible through side-channel effects in the rendering engine. For enterprise environments relying on Chrome for secure browsing, this vulnerability undermines trust in the browser's ability to maintain strict isolation between different origins and contexts. It also poses a risk to users who visit untrusted websites, as even passive viewing of such pages could result in data exfiltration if the crafted HTML successfully triggers the discrepancy.
Mitigation strategies primarily involve immediate software updates to align with the fixed version 152.0.7977.65 or later, which addresses the underlying parsing and rendering inconsistencies. Organizations should ensure that endpoint protection platforms are configured to detect attempts to load known malicious domains associated with exploitation campaigns targeting this specific vulnerability. Additionally, users can employ browser extensions that enforce strict content security policies or disable JavaScript execution on untrusted sites as a temporary defensive measure until patches are applied. Security teams must also monitor for indicators of compromise related to HTML-based phishing kits that may attempt to leverage this flaw in conjunction with social engineering tactics.
This incident aligns with Common Weakness Enumeration categories such as CWE-200, which covers exposure of sensitive information to an unauthorized actor, and potentially CWE-841 regarding improper enforcement of behavioral restrictions for objects. In the context of the MITRE ATT&CK framework, this vulnerability facilitates techniques related to Collection via Browser Capture or Screen Capture if it leads to visual data leakage, as well as potential reconnaissance activities where attackers gather intelligence about victim environments before launching more intrusive attacks. The reliance on crafted HTML highlights the persistent risk posed by complex web standards and browser implementations that must balance feature richness with strict security boundaries. Continuous monitoring of vendor advisories and rapid patch deployment remain critical defenses against such exploitation vectors in modern web browsing ecosystems.