Security Release

• Update Instructions
• Update details on blog

This is a security release to address the following vulnerabilities:

• Attachment requests could be manipulated to leak details/links/metadata (not content) of attachments which the user did not have permission to view.
• The file:// protocol could be abused in some Windows-specific scenarios to auto-run requests with credential information when viewing exports.
  • This protocol is now filtered from interactive content.
• The search system could be abused to cause errors and fill logs.

Upgrade is advised for instances with public viewing enabled, or where untrusted users have authenticated access.

Thanks to Stephen O. / Sakusen (Codeberg, Website), Gurmandeep Deol (LinkedIn), Rafael Castilho (X account) and Gabriel Duarte Guerra (GitHub) for responsibly reporting these issues.

Full List of Changes

• Updated PHP package versions.
• Updated translations with the latest Crowdin changes.
• Updated content allow-filtering to only allow the file:// protocol on anchor hrefs, instead of in all dynamic content.
• Updated attachment update handling to validate permissions before request content.
• Fixed numeric handling issue in tag search when using non-standard numbers.

⚠️ Note: This is the final Strapi 4 release ⚠️

No further updates to Strapi 4 will be published, this release serves as the final version of Strapi 4 which is considered EOL (End-Of-Life) as of April 30th, 2026. All Strapi users should migrate to Strapi 5: https://docs.strapi.io/cms/migration/v4-to-v5/introduction-and-faq

Also please note, this does include Strapi Customers as well. Strapi Cloud will still continue to function with Strapi 4 but that may be subject change in the near future without warning.

What's Changed

Security

• Fixed a critical vulnerability where relational filtering could expose sensitive data through insufficient query sanitization. See GHSA-rjg2-95x7-8qmx / CVE-2026-27886.
• Upgraded tar to v7 to address security warnings.
• Applied v4 dependency security and maintenance updates.

Fixes

• Enforced unique admin email validation when updating the authenticated user profile.

Compatibility

• Added Node.js 22 support for Strapi v4.

Full Changelog: v4.26.1...v4.26.2