External risk intelligence

Quasar Framework SSR Metadata Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-106102

The vulnerability exists in a framework used to build web applications, specifically within server-side rendering (SSR) components. Because SSR frameworks are commonly used to generate public-facing websites and web applications, the vulnerable code path is frequently exposed to the public internet in standard deployment patterns.

Cross-site Scripting

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security flaw has been identified in the Quasar Framework's server-side rendering capabilities that could allow attackers to inject malicious code into web pages. This could lead to the execution of unauthorized scripts, impacting the integrity of user interfaces and potentially exposing sensitive information. The main concern is to confirm if our applications use this specific rendering feature.

Code injection risk in web page rendering.
Matters for user interface integrity and data protection.
Confirm Quasar SSR relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could inject malicious code into dynamic page elements by influencing metadata like post titles or product names. This code could then execute within the user's browser, potentially leading to severe consequences. The vulnerability lies in how the framework handles and inserts user-supplied data into server-rendered pages, bypassing necessary security checks.

Attacker influences dynamic page metadata.
Vulnerable SSR serializer inserts unencoded data.
Risk of arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

An attacker could inject executable markup into server-rendered pages when dynamic metadata is influenced, potentially impacting user-facing content before client-side processing. This occurs because the SSR-only getHead() serializer does not properly encode values interpolated into HTML markup.

User-supplied page metadata.
HTML injection via unencoded metadata.
Compromised page content and user trust.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Quasar Framework's SSR-only getHead() serializer is susceptible to injection attacks via dynamic page metadata. This issue, affecting versions prior to 2.22.0, requires immediate attention from teams managing web applications built with this framework. The first practical move is to identify all instances of the affected framework, confirm their internet reachability and business criticality, and then determine the accountable owner for remediation planning.

Application owners should manage the issue.
Verify external reachability and business criticality.
Plan remediation based on identified risks.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Quasar Framework?

Quasar is a popular open-source framework used by developers to build high-performance user interfaces for web applications using Vue.js. It helps create responsive designs and facilitates server-side rendering (SSR), which allows web pages to be generated on the server before being sent to a user's browser, improving performance and SEO.

What does this CVE-2026-106102 vulnerability mean?

This vulnerability is a form of Cross-Site Scripting (CWE-79) and Improper Encoding (CWE-116). It occurs when the framework fails to properly encode user-supplied text—like a product name or post title—before placing it into a page's metadata. Because the output is not sanitized, an attacker can escape the intended HTML structure to inject and execute their own malicious code in a user's browser.

How is this injection vulnerability triggered?

It is triggered when an attacker influences the dynamic data, such as titles or excerpts, that the server processes for page metadata. The flaw is specific to the SSR-only getHead() serializer. Notably, the client-side apply() path remains safe because it correctly uses DOM APIs that automatically handle attribute encoding, preventing the malicious injection.

Do I need to worry if my app uses Quasar?

According to Halo Surface Signal, this vulnerability is considered likely to affect public-facing applications. Because the flawed code path exists within server-side rendering components, any application that serves pages directly from the server to the internet may be exposed. Applications that are strictly internal or do not use the vulnerable SSR features have a different risk profile.

What should I do first to address this issue?

Your first step is to audit your inventory to identify all applications using Quasar Framework versions prior to 2.22.0. Once identified, evaluate which of these are reachable from the internet or handle sensitive data. Coordinate with your engineering teams to prioritize updating to version 2.22.0 or later, where this serialization flaw has been corrected.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.