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Google Launches XS-Leaks Vulnerability Knowledge Base

Google this week announced the launch of a knowledge base with information on a class of vulnerabilities referred to as cross-site leaks, or XS-Leaks.

Google this week announced the launch of a knowledge base with information on a class of vulnerabilities referred to as cross-site leaks, or XS-Leaks.

These vulnerabilities, Google explains, are rooted in the modern web applications’ misuse of long-standing web platform behaviors, thus resulting in websites leaking information on the user or the information the user has entered in other web applications.

XS-Leaks, the search giant says, are challenging for both security engineers and web browser developers, as they open the door for a broad range of attacks and the deployment of comprehensive defenses is rather complex.

The newly launched XS-Leaks wiki is meant to help the security community better understand these issues and improve defenses. In fact, Google invites security researchers to help expand the wiki and to share details on new attacks and defenses.

The XS-Leaks wiki is available at, providing information on the principles leading to cross-site leaks. It includes small articles detailing each cross-site leak, its implications, and mitigation techniques, along with proof-of-concept code to demonstrate it.

The wiki is also meant to help web developers understand how the defense mechanisms within browsers can keep their applications protected from cross-site leaks.

“Each attack described in the wiki is accompanied by an overview of security features which can thwart or mitigate it; the wiki aims to provide actionable guidance to assist developers in the adoption of new browser security features such as Fetch Metadata Request Headers, Cross-Origin Opener Policy, Cross-Origin Resource Policy, and SameSite cookies,” Google explains.

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The Internet search company encourages the security community to help expand the XS-Leaks wiki with details on both offensive and defensive techniques, noting that its resource might fuel research into mitigating a major class of web security threats.

Related: MITRE Introduces ‘Shield’ Defense Knowledge Base

Related: Meet AttackerKB, Rapid7’s Crowdsourced Vulnerability Knowledge Base

Related: MITRE Releases ATT&CK Knowledge Base for Industrial Control Systems

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

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