Changeset 63100 for branches/6.0/src/wp-includes/kses.php

Timestamp:

08/06/2026 07:38:52 PM (2 months ago)

Author:

desrosj

Message:

Security: Backport the WordPress 7.0.3 security fixes to the 5.9 branch.

• Users: Ensure a proper email address is used before sending email confirmations.
• Formatting: Prevent stack overflow in safecss_filter_attr.
• Multisite: Enforce the active signup policy for existing users.
• HTTP API: Improve compliance with IPv4 Special-Purpose Address Space.
• Users: Prevent Usernames from mangling HTML
• Canonical: Only redirect for publicly viewable post types.
• Administration: When wp_is_large_user_count(), ensure that the post author is always added to author dropdown.
• Editor: Fix output for post date.

Merges [63060],[63061],[63062],[63063],[63064],[63065],[63067] to the 5.9 branch.

Props xknown, westonruter, jeremyfelt, peterwilsoncc, paulkevan, lucasbustamante, jorbin, desrosj, vortfu, dmsnell, johnbillion, ehtis, batmoo, lancewillett, jonsurrell, isabel_brison, bernhard-reiter, tyxla, aduth.

File:

• branches/6.0/src/wp-includes/kses.php (modified) (1 diff)

branches/6.0/src/wp-includes/kses.php

@@ -2471 +2471 @@
                         // Allow CSS calc().
                         $css_test_string = preg_replace( '/calc\(((?:\([^()]*\)?|[^()])*)\)/', '', $css_test_string );
+                        if ( null === $css_test_string ) {
+                                continue;
+                        }
+
                         // Allow CSS var().
                         $css_test_string = preg_replace( '/\(?var\(--[a-zA-Z0-9_-]*\)/', '', $css_test_string );
+                        if ( null === $css_test_string ) {
+                                continue;
+                        }
 
                         // Check for any CSS containing \ ( & } = or comments,
                         // except for url(), calc(), or var() usage checked above.
-                        $allow_css = ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string );
+                        $allow_css = 0 === preg_match( '%[\\\(&=}]|/\*%', $css_test_string );
 
                         /**