CVE-2026-106263

Analyzed Analyzed - Analysis Complete

Improper Input Validation in Google Chrome SignIn

Publication date: 2026-10-06

Last updated on: 2026-10-08

Assigner: Chrome

Description

Improper input validation in SignIn in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to bypass system access restrictions via a crafted Chrome extension. (Chromium security severity: Medium)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-06

Last Modified

2026-10-08

Generated

2026-10-19

AI Q&A

2026-10-06

EPSS Evaluated

2026-10-18

NVD

CVE-2026-106263

EUVD

EUVD-2026-93768

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 155.0.8059.39 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper input validation in the SignIn feature of Google Chrome before version 155.0.8059.39. A remote attacker could exploit this by using social engineering tactics to trick a user into installing a malicious Chrome extension, which could then bypass system access restrictions.

Detection Guidance

This vulnerability involves improper input validation in Google Chrome's SignIn feature, allowing bypass via a crafted extension. Detection requires checking Chrome version and reviewing installed extensions for untrusted sources. Use chrome://version to check version and chrome://extensions to inspect extensions. Ensure Chrome is updated to version 155.0.8059.39 or later.

Impact Analysis

If exploited, this vulnerability could allow an attacker to bypass security restrictions on your system through a crafted Chrome extension. This might lead to unauthorized access to sensitive data or system functions, potentially compromising your privacy and security.

Compliance Impact

This vulnerability involves improper input validation in Google Chrome's SignIn feature, allowing bypass of system access restrictions via a crafted extension. While not directly linked to GDPR or HIPAA, such vulnerabilities could potentially lead to unauthorized data access or processing, which may violate compliance requirements depending on the context of use.

Mitigation Strategies

Update Google Chrome to version 155.0.8059.39 or later to address the improper input validation issue in SignIn.

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