CVE-2026-26274: October CMS has Safe Mode Bypass via Twig Database Write Operations

April 21, 2026 (updated April 24, 2026)

A vulnerability was identified in the Twig sandbox security policy that allowed database write operations when cms.safe_mode is enabled. Backend users with Developer permissions could use Twig template markup to execute insert, update, and delete operations on any database table through the query builder, which is included in the sandbox allow-list.

References

github.com/advisories/GHSA-h6jm-f4hh-fw27
github.com/octobercms/october
github.com/octobercms/october/security/advisories/GHSA-h6jm-f4hh-fw27
nvd.nist.gov/vuln/detail/CVE-2026-26274

Code Behaviors & Features

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