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CVE-2026-106106: Quasar Framework: SSR/SSG dev error page discloses the full shell environment and its </script> escape is bypassable

October 7, 2026

The error page that Quasar CLI shows when an SSR or SSG render throws in development serializes every variable in process.env, every request header and every cookie into the HTTP response, and the dev server binds 0.0.0.0 by default. Any host that can reach the port therefore gets the developer’s cloud keys, registry tokens and database URLs from a single unauthenticated GET. The same page embeds that data inside a <script> element behind a replaceAll('</script>', ...) guard that is ASCII-case-sensitive and requires a literal >, so </SCRIPT>, </script > and </script/> all escape the element and give script execution in the dev server’s origin.

References

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

Code Behaviors & Features

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Affected versions

All versions before 2.2.4

Fixed versions

  • 2.2.4

Solution

Upgrade to version 2.2.4 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-497: Exposure of Sensitive System Information to an Unauthorized Control Sphere
  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

npm/@quasar/render-ssr-error/CVE-2026-106106.yml

Spotted a mistake? Edit the file on GitLab.

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