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

Advisory record · `GHSA-r5mf-4r5x-q78f`

- **Identifiers:** `GHSA-r5mf-4r5x-q78f` · `CVE-2026-106106`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-497](https://cwe.mitre.org/data/definitions/497.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md)
- **Published:** 7 Oct 2026
- **Updated:** 7 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Oct 2026, 16:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `@quasar/render-ssr-error` (npm): affected `<2.2.4`; fixed in `2.2.4`
- `@quasar/app-vite` (npm): affected `<3.3.0`; fixed in `3.3.0`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.1 High, CVSS 4.0: `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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0028, the 20th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:33 UTC: First seen by agentprime
- 31 Oct 2026, 13:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-r5mf-4r5x-q78f)

## Sources

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

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-r5mf-4r5x-q78f>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-r5mf-4r5x-q78f/>. Everything for agents: <https://agentprime.io/llms.txt>.