CVE-2026-106106 Quasar Framework: SSR/SSG dev error page discloses the full shell environment and its </script> escape is bypassable
Attackers can read shell environment secrets and inject scripts via SSR error pages in Quasar development servers, exposing sensitive data and enabling code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-106106?
CVE-2026-106106 is a high-severity vulnerability in @quasar app-vite, published on 6 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to @quasar/render-ssr-error 2.2.4 and @quasar/app-vite 3.3.0, renderSSRError() in utils/render-ssr-error/src/index.js used diagnostic data from utils/render-ssr-error/src/env.js to serialize process.env, request headers, and cookies into the HTTP page returned by serve.devError(), while the development server listened on all interfaces by default. Any network-adjacent client that reaches an SSR or SSG render failure through this development-only error path can obtain shell environment secrets. The renderer escaped only one exact lowercase script closing-tag spelling, so case variants and valid closing-tag delimiter variants in reflected diagnostic data could terminate the script element and inject markup; executing the injected code in a developer browser additionally requires the payload to accompany that developer's request. This issue is fixed in @quasar/render-ssr-error 2.2.4 and @quasar/app-vite 3.3.0.
Which versions are affected by CVE-2026-106106?
4 open source packages ship an affected version, including @quasar/app-vite and @quasar/render-ssr-error.
| Package | Affected | Fixed in |
|---|---|---|
@quasar/app-vite npm | All versions | 3.3.0 |
@quasar/app-vite npm | All versions | 3.3.0 |
@quasar/render-ssr-error npm | All versions | 2.2.4 |
@quasar/render-ssr-error npm | All versions | 2.2.4 |
How do I fix CVE-2026-106106?
Upgrade @quasar/app-vite to 3.3.0 or later.
Is CVE-2026-106106 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-106106 exists.
Sources
Also known as GHSA-r5mf-4r5x-q78f.