---
title: "CVE-2026-106106: Quasar Framework - Stored XSS & Information Disclosure"
description: "Quasar Framework prior to @quasar/render-ssr-error 2.2.4 and @quasar/app-vite 3.3.0 contains a stored XSS caused by improper escaping of diagnostic data in renderSSRError(), letting network-adjacent attackers execute script in developer browsers and access environment secrets, exploit requires attacker to reach SSR or SSG render failure on development server."
url: https://panop.io/threat-heartbeat/CVE-2026-106106/
---

# CVE-2026-106106 Quasar Framework - Stored XSS & Information Disclosure

Quasar Framework prior to @quasar/render-ssr-error 2.2.4 and @quasar/app-vite 3.3.0 contains a stored XSS caused by improper escaping of diagnostic data in renderSSRError(), letting network-adjacent attackers execute script in developer browsers and access environment secrets, exploit requires attacker to reach SSR or SSG render failure on development server.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.28% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-106106)

## Details

Type

Stored XSS

Impact

Client Script Exec, Information Disclosure

CVSS vector

CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

6 October 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to @quasar/render-ssr-error 2.2.4 and @quasar/app-vite 3.3.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-106106](https://nvd.nist.gov/vuln/detail/CVE-2026-106106)
- [https://github.com/quasarframework/quasar/commit/61c2bd8a607785fdade72cce20e8faf1de7eee15](https://github.com/quasarframework/quasar/commit/61c2bd8a607785fdade72cce20e8faf1de7eee15)
- [https://github.com/quasarframework/quasar/releases/tag/@quasar/app-vite-v3.3.0](https://github.com/quasarframework/quasar/releases/tag/@quasar/app-vite-v3.3.0)
- [https://github.com/quasarframework/quasar/security/advisories/GHSA-r5mf-4r5x-q78f](https://github.com/quasarframework/quasar/security/advisories/GHSA-r5mf-4r5x-q78f)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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