Quasar Framework: SSR/SSG dev error page discloses the full shell environment and its </script> escape is bypassable

Summary

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.

Timeline

1. Oct 6, 2026, 5:24 PM UTCCVE published
2. Oct 6, 2026, 6:22 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: no · Technical impact: partial

3. Oct 6, 2026, 6:22 PM UTCRecord last updated

Affected versions

• quasarframework quasar

  fixed in 2.23.3

• @quasar render-ssr-error

  fixed in 2.2.4

• @quasar app-vite

  fixed in 3.3.0

• @quasar/render-ssr-errornpm

  fixed in 2.2.4

• @quasar/app-vitenpm

  fixed in 3.3.0

References 3