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Medium, CVSS 5.1amended

Qwik has a potential mXSS vulnerability due to improper HTML escaping

CVE-2024-41677GHSA-2rwj-7xq8-4gx4

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@builder.io/qwik 1.7.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source
EPSS
  • CVE-2024-41677: 0.50% estimated exploitation activity in the next 30 days; percentile 42.68 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary A potential mXSS vulnerability exists in Qwik for versions up to 1.6.0. Details Qwik improperly escapes HTML on server-side rendering. It converts strings according to the following rules: https://github.com/QwikDev/qwik/blob/v1.5.5/packages/qwik/src/core/render/ssr/render-ssr.ts#L1182-L1208 - If the string is an attribute value: - " - &quot; - & - &amp; - Other characters - No conversion - Otherwise: - < - &lt; - - &gt; - & - &amp; - Other characters - No conversion It sometimes causes the situation that the final DOM tree rendered on browsers is different from what Qwik expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). PoC A vulnerable component: If a user accesses the following URL, then, alert(123) will be executed. Impact XSS

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-2rwj-7xq8-4gx4

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-2rwj-7xq8-4gx4

Agent brief

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# Patch Next advisory brief: CVE-2024-41677

Advisory: Qwik has a potential mXSS vulnerability due to improper HTML escaping
IDs: CVE-2024-41677, GHSA-2rwj-7xq8-4gx4
Record: https://patchnext.com/advisories/cve-2024-41677 (revision 3, source checked 26 Oct 2026, 12:31 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @builder.io/qwik 1.7.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @builder.io/qwik: affected < 1.7.3; fixed in 1.7.3

## Suggested inspection (read-only)
- `npm ls @builder.io/qwik --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @builder.io/qwik.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-2rwj-7xq8-4gx4 (OSV record GHSA-2rwj-7xq8-4gx4 lists affected ranges: npm @builder.io/qwik >=0 <1.7.3 (fixed))
- Verified: https://github.com/advisories/GHSA-2rwj-7xq8-4gx4 (GitHub-reviewed advisory GHSA-2rwj-7xq8-4gx4 lists affected ranges: npm @builder.io/qwik >=0 <1.7.3)

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