TYPO3 Exception 1588095935¶
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#1588095935 TYPO3\CMS\Core\Http\Security\MissingReferrerException Missing referrer for /main
This error came up after logging into the backend or install tool after updating from TYPO3 9.5.16 to 9.5.20. The error was caused by the feature “security.backend.enforceReferrer” which was introduced in 9.5.17(?) and is enabled by default.
Disable the feature by editing
'SYS' => [ 'features' => [ 'security.backend.enforceReferrer' => false, ], ]