Avoid fatal errors by checking POST validity #86
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brent-dxw
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Dec 22, 2025
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This breaks login with 2fa..
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An attacker is currently attempting to find vulnerabilites on our sites. Fatal errors are being generated via 2fa via `wp-login.php` ``` PHP Fatal error: Uncaught TypeError: trim(): Argument #1 ($string) must be of type string, array given in /var/www/html/wp-includes/pluggable.php:686 Stack trace: #0 /var/www/html/wp-includes/pluggable.php(686): trim() #1 /var/www/html/wp-content/plugins/2fa/lib/login.php(168): wp_authenticate() #2 /var/www/html/wp-includes/class-wp-hook.php(341): {closure}() #3 /var/www/html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters() #4 /var/www/html/wp-includes/plugin.php(522): WP_Hook->do_action() #5 /var/www/html/wp-login.php(571): do_action() #6 {main} thrown in /var/www/html/wp-includes/pluggable.php on line 686 ``` This is happening because POST variables are being presented as arrays but processed using string-only functions. We should be checking for strings before using user-supplied values like this.
``` PHP Warning: Array to string conversion in /var/www/html/wp-includes/formatting.php on line 1128 "GET /wp-login.php?reauth=1&redirect_to[%24ne]=https://accessibility.blog.gov.uk/wp-admin/ HTTP/1.1" ```
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brent-dxw
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lgtm locally- works with email 2fa on blogs site and still works for user without 2fa
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An attacker is currently attempting to find vulnerabilites on our sites.
Fatal errors are being generated via 2fa via
wp-login.phpThis is happening because POST variables are being presented as arrays but processed using string-only functions.
We should be checking for strings before using user-supplied values like this.