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Published Jun. 30, 2025

Polyfill.io Vulnerability: Is Liferay affected?

Written By

Madhusudan Sharma

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Issue

  • An attribute polyfill:true is observed in the source code of the website.
  • Does it have anything to do with the domain 'https://polyfill.io'?
  • Is Liferay affected by the Polyfill.js vulnerability? 

Environment

  • All environments [DXP 7.0 - DXP 7.4]

Resolution

  • Polyfill is a common programming term, like mock , stub , algorithm.  It often refers to JavaScript code that implements an HTML5 or CSS web standard, either an established standard (supported by some browsers) on older browsers, or a proposed standard (not supported by any browsers) on existing browsers.
  • The domain 'https://polyfill.io' provides "polyfills" that add functionality to older browsers built into newer versions.
  • However, Liferay doesn't rely cdn.polyfill.io or other *.polyfil.io domains to retrieve any polyfills and is not exposed to Polyfill.js vulnerability.
  • Please note that the third-party dependencies could include the polyfills from the domain 'https://polyfill.io' dynamically, so it is recommended that users should check any custom themes or developments to make sure they don’t use this URL to get their polyfills either.

Additional Information

  • For more details on best practices when opening a security ticket: Before Opening a Security Ticket
  • Please submit a ticket to the Support team through the Help Center in case more information is required on this. 
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