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  5. CVE-2025-15265

CVE-2025-15265: svelte vulnerable to Cross-site Scripting

January 15, 2026

An XSS vulnerability exists in Svelte 5.46.0-2 resulting from improper escaping of hydratable keys. If these keys incorporate untrusted user input, arbitrary JavaScript can be injected into server-rendered HTML.

References

  • github.com/advisories/GHSA-6738-r8g5-qwp3
  • github.com/sveltejs/svelte
  • github.com/sveltejs/svelte/commit/ef81048e238844b729942441541d6dcfe6c8ccca
  • github.com/sveltejs/svelte/releases/tag/svelte%405.46.4
  • github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3
  • nvd.nist.gov/vuln/detail/CVE-2025-15265

Code Behaviors & Features

Detect and mitigate CVE-2025-15265 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions starting from 5.46.0 before 5.46.4

Fixed versions

  • 5.46.4

Solution

Upgrade to version 5.46.4 or above.

Impact 5.4 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Source file

npm/svelte/CVE-2025-15265.yml

Spotted a mistake? Edit the file on GitLab.

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