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TI-2026-30853 Aliases CVE-2026-42573GHSA-rcqx-6q8c-2c42

Svelte: XSS via DOM Clobbering of Internal Framework State

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00342 27th percentileScored 2026-11-07
Fix Fixed svelte (sveltejs): 5.55.7svelte (npm): 5.55.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sveltejssveltebefore 5.55.75.55.7Patch availableCNA
—svelte (npm)before 5.55.75.55.7Patch availableGHSA-rcqx-6q8c-2c42
  • svelte Vendorsveltejs Affected before 5.55.7 Fixed in 5.55.7 Patch available CNA
  • svelte (npm) Vendor— Affected before 5.55.7 Fixed in 5.55.7 Patch available GHSA-rcqx-6q8c-2c42

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:*before 5.55.7Vulnerablesveltejs
  • cpe:2.3:a:svelte:svelte:*:*:*:*:*:node.js:*:* Versions before 5.55.7 Vulnerable ·sveltejs

Remediation

  • Fix · CNA svelte (sveltejs) Fixed in 5.55.7
  • Fix · GHSA-rcqx-6q8c-2c42 svelte (npm) Fixed in 5.55.7 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Build of Podman Desktop

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42573
  2. 2026-10-03 Alias added: GHSA-rcqx-6q8c-2c42

References

Advisory 2

Other 2

  • TI-2024-30159 Potential mXSS vulnerability due to improper HTML escaping in svelte CVSS 3.1MEDIUM 6.1
  • TI-2025-13940 Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR) CVSS 4.0MEDIUM 5.3
  • TI-2021-10070 The unofficial Svelte extension before 104.8.0 for Visual Studio Code allows attackers to… CVSS 3.1HIGH 7.8
  • TI-2022-09436 Cross-site scripting (XSS) in svelte CVSS 3.1MEDIUM 6.1
  • TI-2026-30847 Svelte: ReDoS in `<svelte:element>` Tag Validation CVSS 4.0MEDIUM 5.9
  • TI-2026-22246 Svelte Vulnerable to XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers CVSS 4.0MEDIUM 5.3
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences