Svelte Vulnerable to XSS via DOM Clobbering of Internal Framework State

Description

Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks.

Recommendation

Update the svelte package to the latest compatible version. Followings are version details:

• Affected version(s): <= 5.55.6
• Patched version(s): 5.55.7

References

• GHSA-rcqx-6q8c-2c42
• CVE-2026-42573
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• wetty vulnerable to DOM XSS via file-download filename - CVE-2026-49864
• CleverTap Web SDK is vulnerable to DOM-based XSS via handleCustomHtmlPreviewPostMessageEvent function - CVE-2026-26861
• CleverTap Web SDK is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage - CVE-2026-26862
• Nuxt OG Image is vulnerable to reflected XSS via query parameter injection into HTML attributes - CVE-2026-34405

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Tags:

npm

svelte