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MEDIUM severity

CVE-2023-0410 — qwik

MEDIUMFix: builderio/qwik@4b2f89d

CVE-2023-0410 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in @builder.io/qwik. A fix is available for @builder.io/qwik — see the affected versions and patch details below.

Cross-site Scripting (XSS) - Generic in builderio/qwik

Also known asGHSA-hm7f-rq7q-j9xp
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-0410.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs41th percentile — riskier than 41% of all scored CVEsHighest risk
0.00%0.33%0.65%0.98%0.3%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

29other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@builder.io/qwiknpm
57Kdownloads / week

Description

@builder.io/qwik prior to version 0.16.2 is vulnerable to cross-site scripting due to attribute names and the class attribute values not being properly handled.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@builder.io/qwikall versions0.16.2npm install @builder.io/qwik@0.16.2

Affected Products

1 product · 1 configurations
Application
qwikqwik
< 0.16.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @builder.io/qwik, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @builder.io/qwik to 0.16.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-0410 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

@builder.io/qwik prior to version 0.16.2 is vulnerable to cross-site scripting due to attribute names and the class attribute values not being properly handled.
O3 Security · Impact-Aware SCA

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CVE-2023-0410: qwik XSS — Fixed in 0.16.2