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

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-03 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

QwikDev qwik: before 1.19.0 — fixed in 1.19.0

How to fix

Upgrade to a fixed version: QwikDev qwik 1.19.0. Check the vendor advisory for mitigations.

References

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